Author: rbuchholz

Howdy, BugFans,

The BugLady was checking around the edge of a gravel parking lot near the Ozaukee Washington Land Trust’s Lake Twelve property (because there are bugs there, too) when she found this beauty (it took two trips and two different cameras to get a few almost-in-focus shots – sometimes it’s like that).

She had two immediate reactions: 1) what is it? And 2) it looks like an octopus clinging to a reef!

It’s a crab spider in the tree crab spider genus Tmarus, probably Tmarus angulatus (thanks, as always, to BugFan Mike).  Mike says that there are a few documented records of this species in Wisconsin, but they are probably more common, it’s just that we don’t typically hunt for spiders in trees.  And, of course, they seem to have the “camouflage” thing figured out.

Crab spiders (family Thomisidae), best known for the species that ambush insects on flower tops, are long-time favorites of the BugLady https://uwm.edu/field-station/an-album-of-crab-spiders/.  They get their name from their tendency to hold those four, extra-long front legs in a crab-like pose and for their tendency to move sideways.  Crab spiders don’t spin trap webs to catch their prey, they ambush it on the hoof.  They paralyze their prey and then introduce (bugguide.net says “vomit”) digestive enzymes into it, wait for its innards to soften, suck out the tenderized tissue, and throw away the empty.

They do spin silk, protecting themselves from a fall by playing out a drop line as they hunt, and this Tmarus spider was guarding her eggs in a chamber she created by bending and webbing together a slender day lily leaf.  She will stay nearby for about a month to protect her eggs from predators.

About the genus Tmarus the BugLady could find very little.  The spiders appear regularly on state biodiversity lists, and there are a bunch of scholarly articles about new species being discovered in different countries around the world (one article from Sri Lanka was titled “Twigs that are not Twigs”).  The BugLady was gratified to find that the spectacular Tmarus marmoreus spider in Australia is, indeed, nicknamed the Octopus spider https://www.brisbaneinsects.com/brisbane_spiders/OctopusCrabSpider.htm.  It hunts by dangling from a line of silk with its front legs poised and ready.

Their knobby bodies are usually well-camouflaged on bark and other vegetation, where they look like buds or broken twigs.  The Field Guide to the Spiders of California and the Pacific Coast States tells us that with “forelegs along either side of a stem, they wait for an insect to wander between them.”  According to the Kansas School Emporium’s Checklist of Kansas Crab Spiders, Tmarus spiders have been observed eating ants, which most spiders avoid.

Tmarus angulatus, sometimes called the Tuberculated crab spider, is small spider with a body about a half-inch long (females are larger than males) that is found across the US and southern Canada.  Some are pale and some were dark, and the BugLady saw a picture of a gravid female with a dark cephalothorax (front end) and a pale abdomen, with a caption that said that she looked like a spittlebug nest.  Well, maybe.  Here’s a little gallery of shots of Tmarus angulatus looking like the flower head of a rush https://bugguide.net/node/view/646754,

pale-colored https://bugguide.net/node/view/1168821,

in the open https://bugguide.net/node/view/1516412/bgimage,

a male https://bugguide.net/node/view/1516412/bgimage,

oriented with its legs up https://bugguide.net/node/view/1238420/bgimage,

very well camouflaged https://bugguide.net/node/view/1043877/bgimage,

and https://bugguide.net/node/view/1223511/bgimage,

and a nice egg-to-spiderling series https://bugguide.net/node/view/298740/bgimage.

Tmarus angulatus was described and named in 1837 by Baron Charles Athanase Walckenaer (1771 – 1852), who is described as a French civil servant and scientist.  In fact, he squeezed the pursuits of several lifetimes into his 80 years.  He was a geographer who was named Conservator for the Department of Maps at the Royal Library in Paris, was Secretary for life of the Academie des Inscriptions et Belles Lettres (where he introduced the French to the English genre of the biography), was a co-founder of the Societe entomologique de France, member of a group of early anthropologists called the Societe des observateurs de l’homme, was mayor of a section of Paris, found a map of the Americas drawn by Columbus contemporary Juan de la Cosa (the earliest known map of the new World), and was an arachnologist and entomologist (author of Histoire naturelle des insects).

Kate Redmond, The BugLady

Bug of the Week archives:
http://uwm.edu/field-station/category/bug-of-the-week/

Howdy, BugFans,

The BugLady is always excited when she finds an insect she’s never seen before – even more so when it’s a giant, orange and gray “Holy S@#&!” beetle. 

She was moseying along the trail at Riveredge Nature Center at the beginning of July when she saw a flash of orange in the vegetation.  A big flash.  She craned and fidgeted and crossed her fingers while the beetle crawled around, revealing itself by degrees.  After posing for a few shots, it flew out noisily and landed on her jeans for a second, and then moved on. 

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It’s a spectacular beetle, (Dr. John Hamilton, writing in The Canadian Entomologist in 1885 says that “this appears to be a rare Cerambyan, and among the choicer.”), but there’s not much information out there about it (it isbig enough and beautiful enough, but apparently, it’s not bad enough to warrant attention). 

To put it in context – with about 390,000 species (25,000-plus in North America), beetles (order Coleoptera) are the largest order in the whole animal kingdom, not just in the Class Insecta.  Long-horned beetles (family Cerambycidae), those darlings of the beetle world (because https://bugguide.net/node/view/199424/bgpage, and https://bugguide.net/node/view/674692/bgimage, and https://bugguide.net/node/view/128536/bgpage, and https://bugguide.net/node/view/1379236/bgimage, and more), number about 30,000 species worldwide with only about 1,000 in North America.  The MLHB is in the Flower longhorn subfamily Lepturinae, a group of sometimes-dramatically-wedge-shaped longhorns (https://bugguide.net/node/view/131694/bgpage) that hang out on flower tops by day.  There are a dozen species in the genus Stenocorus in North America – more elsewhere.

At 1 ¼” the Majestic long-horned beetle (Stenocorus schaumii) is indeed majestic.  It comes in two colors (https://bugguide.net/node/view/1499994/bgimage) and some are more chiseled than others https://bugguide.net/node/view/6759/bgimage (the BugLady’s MLHB was not svelte), and females are notably larger than males.  It is mostly eastern-ish – bugguide.net says New Brunswick to North Carolina to Manitoba to Oklahoma.  A number of the search hits were from eastern Canada, in French. 

Cerambycid larvae are vegetarians; some are pests of living plants, some feed inside dead or dying wood, and the interests of many do not collide with ours.  MLHB larvae feed/develop in ash, beech, maple, serviceberry, and other hardwoods, and the adults eat nectar and pollen. 

The MLHB was described by LeConte and is one of several insects named for German entomologist Hermann Rudolf Schaum, a go-to guy for all-things beetle in the mid-1800’s, who wrote and corresponded prolifically with American entomologists.  Schaum apparently believed that the Continent should be the clearinghouse for insect classification.  In a history of American entomology called Brethren of the Net: American Entomology, 1840-1880, author Willis Conner Sorenson tells us that “Schaum…..objected to the notion that ‘American insects ought to be described by American entomologists.’  The result, he said, had been the proliferation of isolated descriptions, a practice that had been characterized by Schaum’s colleague Erichson, as ‘the nuisance of science.’  Schaum regretted that American entomologists had added to this nuisance.” 

Entomology as Blood Sport.

Kate Redmond, The BugLady 

Bug of the Week archives:
http://uwm.edu/field-station/category/bug-of-the-week/

Hi, BugFans,

The BugLady wrote this article for a recent newsletter of the Friends of the Cedarburg Bog (an organization that would love your support).

Slime molds are strange and wonderful life forms that can exist as tiny, single cells, but can also form a mass of cells that acts like an organism – and moves!

Back in the days when fungi (now placed in their own Kingdom) were classified as plants, slime molds were classified with the fungi. Today, slime molds defy exact classification (slime molds can’t be plants because slime molds eat!). They’re placed in a catch-all group that some people call the kingdom Protista, made up of often unrelated single-celled or colonial single-celled organisms that have similar structures and life styles. Australian researcher Chris Reid calls Protists “a taxonomic group reserved for everything we don’t understand.” They’ve been around for a billion years.

They may be so small that they live their whole lives under our radar, moving slowly through the soil; or they may aggregate to form bright yellow or white, spongy blobs on the forest floor, or pink spheres on decaying wood, or tiny, brown cattail shapes on branches. Or, they might start as the first and end as the second. They have great names, like wolf’s milk, tapioca, pretzel, white coral, red raspberry, chocolate tube, dog vomit and scrambled egg slime.

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Two of the main groups are the cellular slime molds (Dictyosteliida) and the plasmodial or acellular slime molds (Myxogastria). Both kinds start out as tiny, single-celled amoeba-like critters in soil or rotting material, both can use chemicals to communicate, and both, at some sign from their environment, may congregate and go into reproductive mode, transforming from a single-celled organism to a giant “megacell” (one scientist calls them “a bag of amoebas”). They feed on bacteria, algae, and fungal spores and help organic materials to decompose. They are eaten by many small animals (there are little, shiny, brown beetles apparently feeding – and cavorting – in the pink slime mold), and some are said to be edible by humans.

Their orientation is deliberate; their ability to pick the most direct route to food mimics the efficient layout of expressways and railroad systems; they were the inspiration for the Sci-fi movie “The Blob;” the math that describes their orderly aggregation is applied to video games; and some can anticipate change, learn to solve mazes and remember. And when they are chopped up, they reassemble and remember.

For more information, see

https://www.scientificamerican.com/article/brainless-slime-molds/ and

https://www.pbs.org/newshour/science/the-sublime-slime-mold and

http://www.wisconsinmushrooms.com/.

Kate Redmond, The BugLady

Bug of the Week archives:
http://uwm.edu/field-station/category/bug-of-the-week/

Howdy, BugFans,

The BugLady loves these fancy little flies (and their habitat preferences, for the damp and the dappled, are similar to hers).  Dance flies are abroad in June, and they are one of the BugLady’s “nemesis bugs;” they seem to object to being in focus, but this small spider managed to capture one.  They starred in a BOTW episode at the very end of June, ten years ago: https://uwm.edu/field-station/dance-fly-family-empididae/. 

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Go outside – look at bugs.  Tell the BugLady what you see.

Kate Redmond, The BugLady

Bug of the Week archives:
http://uwm.edu/field-station/category/bug-of-the-week/

Greetings, BugFans,

As long-time BugFans know, the BugLady gets a kick out of weevils.  She found these cute little Iris weevils (Mononychus vulpeculus) recently, scampering around on flowers at the Ozaukee Washington Land Trust’s Cedarburg Environmental Study Area (CESA) site (for directions to and maps of their properties, see https://owlt.org/visit-our-preserves).  Obviously, iris weevils are not exclusive to iris – the BugLady sees them on ox-eye daisy and daisy fleabane (she did find two of them sitting on an iris petal that had tiny holes punched in it, but they were camera shy).  Iris weevils were half of an episode about weevils that was posted four years ago https://uwm.edu/field-station/gardening-with-weevils/. 

For a story about another CESA adventure, see https://uwm.edu/field-station/the-ants-of-cesa/.

Support your local Land Trust. 

Kate Redmond, The BugLady

Bug of the Week archives:
http://uwm.edu/field-station/category/bug-of-the-week/

Greetings, BugFans,

The BugLady’s favorite insect is the Tiger Swallowtail (Mom likes me best), but in the crowded field for second place, the Luna Moth is pretty close to the top.  

Luna moths (Actias luna) are in the Giant Silkworm/Royal Moth family Saturnidae (of previous BOTW fame https://uwm.edu/field-station/giant-silk-moths-family-saturnidae/), whose family members have ringed eyespots reminiscent of Saturn.  The LM’s name came from eyespots that resemble moons (eyespots that make predators ponder whether their target might be different than they originally thought).  Actias is a small genus with about two dozen species worldwide, and the LM is the only American species.  They are found in wooded areas east of the Great (on rare occasions, LMs have made their way to Europe).

And giant they are, with wingspreads that often exceed four inches.  Males and females look pretty much alike; her egg-laden abdomen is larger than his, and his antennae are fancier than hers.  Both have what’s called quadripectinate antennae, which means that they are comb-like, with four “tines” per unit of the antenna https://bugguide.net/node/view/754599/bgimage, https://bugguide.net/node/view/293789/bgimage, and the female https://bugguide.net/node/view/426762/bgimage.  Their long, twisted tails are said to interfere with bat radar, and they also present a false target for predators – bats manage to snag some LMs, but many others get away after the bat mistakenly grabs them by those spectacular tails.  

(LMs make photographers sweat (“please don’t let me screw up, please don’t let me screw up….).  Here are some photographers who didn’t screw up https://bugguide.net/node/view/20728/bgimage,https://bugguide.net/node/view/617459/bgimage, https://bugguide.net/node/view/655366/bgimage, https://bugguide.net/node/view/917529/bgimage, and (possibly posed) https://bugguide.net/node/view/1532344/bgimage).

Warming weather signals them to emerge from their cocoons, which they accomplish with the aid of an enzyme (named cocoonase!!) that they secrete to soften the dried silk and of a hard spur at the base of each front wing, which they use to break through it; here’s a video and of an LM eclosing (emerging) https://www.youtube.com/watch?v=FECzFIRPeD4, and some still shots https://bugguide.net/node/view/481690/bgimage.  Then they pump up their wings and begin their short lives as adults.  Females emit a pheromone that calls males to her perch.  His feathery antennae allow him to sense a mere handful of scent molecules from two or more miles away and to follow the increasingly concentrated scent trail to her.  Lunas are nocturnal, and most mating occurs after midnight.   

Adults have neither mouth nor gut, and they live only about a week, dying soon after they reproduce.  There is one brood per year here in God’s Country, and two or three in the south. 

Females lay between 200 and 400 eggs, singly and in clumps, on host plants.  LM caterpillars feed on the leaves of birch, hickory, walnut, maple, and sumac, and add sweet gum, pecan, and persimmon in the south (they aren’t considered forest pests).  They show regional favoritism – LMs in our area prefer birch and do badly if moved to a different food plant.  One theory is that LM caterpillars are capable of processing the defense chemicals produced by their host trees, and they may become specialists in detoxifying a particular species.  Young caterpillars https://bugguide.net/node/view/1434316/bgimage are knobbier than older ones https://bugguide.net/node/view/1191475/bgimage.  

Mature caterpillars become dark red before pupating; they drop to the ground and use silk to wrap themselves in a leaf for the winter https://bugguide.net/node/view/1191457/bgimage, camouflaged in the litter of the forest floor.  LM pupae are not passive – if they are disturbed, they will move noisily within their cocoon.  Jim Sogaard, writing in Moths and Caterpillars of the North Woods tells us that “The pupa has a clear ‘window’ through which even dim light can stimulate the brain.  Photoperiod likely contributes to breaking diapause [the suspended animation of winter].  If a cocoon is moved, the pupa within may noisily reorient itself to the light.”  Here’s a nice stage-by-stage series: https://bugguide.net/node/view/945719. 

A two inch long LM caterpillar looks like a feast for any predator that finds it despite its green camouflage, but the caterpillar has a bag of tricks that includes rearing up on its back legs, warning its would-be attacker by making clicking sounds with its mandibles, and then regurgitating the noxious contents of its intestine. 

LMs are not common, and they are becoming less so.  Their natural predators include bats, owls (one source told of a Screech Owl that fed on males that came to visit a female calling from a branch), spiders, and toads. 

Human activities also impact them: 

• A tachinid fly imported in 1906 to control gypsy moths now parasitizes the caterpillars of almost 200 species of native butterflies and moths, including the giant silk moths.

• Habitat loss due to urban street trees being cut and deciduous woods becoming more fragmented.  The caterpillars can’t adapt to non-native tree plantings.

• Pesticides that affect not only the leaves that the caterpillars eat, but also the immobile pupa, and even the short-lived adults.  

• Light pollution – LMs are strongly attracted to lights at night, exposing them to predators and, with the clock ticking loudly, distracting them from the task at hand.

Fun Luna Moth Fact – a bunch of butterflies have been featured on US postage stamps, but in 1987, the LM became the only moth (before or since) to be so honored.

Just in case you still haven’t seen enough LM images, https://www.marylandbiodiversity.com/viewSpecies.php?species=345. 

Look for them in the month of June. 

To paraphrase the Bard, “O brave new world, that has such creatures in’t!”

Kate Redmond, The BugLady

Bug of the Week archives:
http://uwm.edu/field-station/category/bug-of-the-week/

Salutations, BugFans,

Life is busy, and besides, May is National Wetland Month, so here’s a rerun from ten years ago.  A few new words and pictures. 

The BugLady will visit these guys together because even though they are, in a sense, photo-negatives of each other, they are often mistaken for one another (until you know the secret handshake). The majority of aquatic animals, from orcas to Mergansers to muskies to water boatmen tend to be dorsally dark and ventrally light (have dark backs and light bellies).  This coloring is protective because a predator looking down from above has to distinguish its dark-backed prey from the dark water surface, and a predator looking up from below sees a light belly against a surface that reflects the light of the sky.  The backswimmer, which spends its life rowing around belly-up, flip-flops the usual color scheme and has a dark belly and a light back. 

These two aquatic, boat-shaped, less-than-a-half-inch-long, “True Bugs” (Order Hemiptera) are not in the same family, and the water boatman also departs from the usual mouthparts and diet of its compatriots, but they have many similarities.  They are found in still waters – preferably with aquatic plants – including ponds, lake edges, sewerage ponds, bird baths, and even swimming pools (lots of websites devoted to getting rid of water boatmen and backswimmers in swimming pools), and they are more active in the dark than in the light.  They locomote via rowing movements of their flattened third pair of legs (backswimmers) or second and third pair of legs (water boatmen) and are often seen swimming or grabbing plant stems in a head-down position. They are strong fliers, although the up-side-down backswimmer must climb out of the water and flip over onto its belly before it can spread its wings and take off.

Both bring a tank of oxygen with them as they swim underwater.  The backswimmer stores air in two hair-covered troughs on the ventral side of its abdomen (it can stay underwater for as long as six hours), and the water boatman wraps a bubble of air under its wings and around its abdomen and also picks up dissolved oxygen from the water (it is so buoyant that it must grab vegetation in order to keep from floating to the surface).  Both overwinter as adults, and some water boatmen may remain active under the ice.  The males of both groups stridulate – rub rough area on their front legs against their head – “chirping” underwater to attract mates. 

Backswimmers (family Notonectidae) are piercer-predators that kill and suck the bodily fluids out of any prey they can subdue – invertebrate and vertebrate alike – including tiny tadpoles and fish fry (but big fish eat backswimmers).  Each set of legs is used for a different function – the front pair for catching their prey, the middle pair for holding the prey tight, and the flattened, hairy third pair acts as oars.

These little “Davids” will sometimes go after Goliath, piercing the leg of a human swimmer or wader, a habit that has earned them the name of “water bee” or “water wasp.”  It is a painful, burning bite that can have lasting effects in those who may be “susceptible to poisons,” according to Anne Haven Morgan in the Field Book of Ponds and Streams.

The often red-eyed Water boatmen (Family Corixidae) are a bit smaller than backswimmers.  Collector-gatherers, they swim along the bottom of the pond, head down, in search of food, and they use their front pair of legs to scoop it up.  Lacking the standard piercing beak issued to other aquatic true bugs, they ingest living material – diatoms, algae, protozoa, nematodes, small insects – that they find when they stir up debris on the bottom of a body of water. Some suck juices from algae. 

The eggs and the adults of water boatmen are eaten by birds and by humans (an Egyptian and a Mexican delicacy, according to some references) and were said to have been introduced to England as a food source.  The Handy Bug Answer Book by Dr. Gilbert Waldbauer recounts how bundles of rushes that are put into ponds in Mexico as a substrate for water boatmen to lay their eggs upon are removed, dried, and beaten to loosen the eggs.  The eggs are then cleaned and ground into flour to make a cake called “hautle.”

Besides their surprising edibility and the fact that they are said to smell like bedbugs, the water boatman’s only other claim to fame is that the males of some species make ultrasonic mating calls with what Monty Python would call their “Naughty-bits.”  Do not try this at home.

Kate Redmond, The BugLady

Bug of the Week archives:
http://uwm.edu/field-station/category/bug-of-the-week/

Greetings, BugFans,

The poet Muriel Rukeyser once wrote, “The universe is made of stories, not of atoms.”  The BugLady sees lots of tableaux unfolding as she ambles across the landscape (most have to do with food or sex).  Because she was taught, at an impressionable age, by a professor who said “Don’t just tell them what it is, tell them ‘what about it,’” she tries to read the stories and understand the “what-about-its”. 

The SPIDER and the FLY – and the AMBUSH BUG

Heterospecific (belonging to different species) predators mostly don’t share, and both the spider and the ambush bug would consider this fly to be a toothsome morsel.  The BugLady figures that the ambush bug caught it, and the slender crab spider (Tibellus sp) saw the struggle and popped over to investigate, but not to appropriate it.

BUCKTHORN

Glossy buckthorn is a Eurasian shrub that was brought over in the late 1800’s to be a lawn/hedge shrub, but because it is a “bird poop seed,” it didn’t stay domesticated.  It is a huge problem in wetlands (well, actually, it likes wet, dry, sunny and shady soils) and like other invasive plants, it left its natural grazers behind in the Old Country.  The BugLady found this sawfly larva eating buckthorn leaves (she had previously photographed a lightning beetle apparently feeding on nectar or pollen from a buckthorn flower), thus demonstrating the Reinartz Law of Biomass Availability, aka “If you grow it, they will come.”  More scientifically put, glossy buckthorn (and other invasive plants) represent a huge biomass of potential food, and eventually herbivores will figure out that they’re edible.  Sooner, we hope, rather than later. 

DOR IN OHIO –

Why did the Japanese beetle cross the road?  The story that the BugLady reads here was initiated by the picture’s shiny green centerpiece, a Japanese beetle that did not survive the crossing.  It proved attractive in death to two opportunistic scavengers, a millipede and a daddy long-legs (that better keep their wits about them or they might not get across, either).  The daddy long-legs’ legs are decorated by nymphs of red mites, which go through a tick-like, parasitic phase before they grow up to eat insect eggs and very small invertebrates. 

GYPSY MOTH ON BEECH

This picture shows three out of four life stages occurring within inches of each other.  Gypsy moth larvae get around pretty well – newly-hatched caterpillars use silk to balloon to new locations, and if they and their confreresdefoliate the tree they land on, they’ll take off on foot to find another!  Adult females are a different story.  They emerge from their pupal case flightless, use pheromones to lure flying males to their tree trunk perch, and then create an egg case on the same spot.  Not surprisingly, the BugLady is not a rabid advocate of gypsy-moth-control: https://uwm.edu/field-station/gypsy-moth/.

EGG-GUARDING SPIDER

The BugLady photographed this female Philodromid (running crab) spider over a period of four days, guarding the eggs that she had placed inside an empty beech nut (did that nut shell land randomly on the leaf and stay there, or could a spider haul it up to the leaf’s surface?).  Egg guarding is common among philodromids, and she hung tough, day after day, as the BugLady and her one-eyed camera loomed above her (the BugLady appreciates cooperative subjects, and she thanks them, but she worries about their survival instincts).  On the fifth day, the spider was gone, and the ending of this story is a mystery. 

CRAB SPIDER AND RIPIPHORUS

What’s a collection of pictures without a crab spider, in this case a lovely northern crab spider (Mecaphesa asperata), sitting on a Grass of Parnassus flower, preying on a Ripiphorus beetle (and illustrating, once again, that when it comes to camouflage, crab spiders got it right)?  Ripiphorus/ Rhipiphorus beetles (the genus seems to be spelled both ways) are fly mimics, but the BugLady still doesn’t see the advantage of looking like a fly when you could look like a beetle.  For the scoop on Ripiphorus, see https://uwm.edu/field-station/its-a-beetle-really/.    

MULLEIN TABLEUX

Mullein was deliberately introduced to North America in the 1600’s because the newly-arrived settlers loved it and had many uses for it back home (six species in this collection, including, of course, the European Americans themselves, are “non-native”).  Mullein seed weevils were introduced for the purpose of eating mullein seeds, which they do with about 50% efficiency (https://uwm.edu/field-station/mullein-watching/).  The BugLady was thinking, as she photographed the weevils, that (speaking of crab spiders) their trip to the honeymoon suite might not turn out as planned. 

EXUVIA 

And finally, spring is a time of rebirth, renewal, and resurrection.  What better symbol of that spirit than the empty shell (exuvia) of a baskettail dragonfly naiad that emerged from a winter spent in the watery world below the ice, climbed up (in this case) the stalk of a horsetail/equisetum, broke out of its old skin, and cast its die as a creature of the air? 

Kate Redmond, The BugLady

Bug of the Week archives:
http://uwm.edu/field-station/category/bug-of-the-week/