1.		With functional wings………………………2 Without functional wings, or with forewings thickened and concealing membranous hindwings……………………15
2.		Wings covered with minute scales; mouthparts usually a coiled tube (butterflies, moths)…The specimen is Lepidoptera (select the submit button to confirm your selection) Wings usually clear, not covered with scales; mouthparts not a coiled tube……..3
3.		With one pair of wings (true flies)……….The specimen is Diptera (select the submit button to confirm your selection) With two pairs of wings………4
4.		Wings long, narrow, fringed with long hairs, body length 5 mm or less (thrips)……The specimen is Thysanoptera (select the submit button to confirm your selection) Wings not narrow and fringed, body usually longer than 5 mm…….5
5.		Abdomen with two or three threadlike "tails"; hindwings small (mayflies)….The specimen is Ephemeroptera (select the submit button to confirm your selection) Abdomen with only short filaments or none; hindwings larger………6
6.		Forewings clearly longer and with greater area than hindwings………7 Forewings not longer, or slightly longer than hindwings, and with same or less area than hindwings……………….9
7.		Forewings noticeably hairy; antennae as long or longer than body (caddis flies)…….The specimen is Trichoptera (select the submit button to confirm your selection) Wings transparent or translucent, not hairy; antennae shorter than body………..8
8.		Tarsi 2-segmented or 3-segmented; body not wasplike or beelike…….14 Tarsi 5-segmented; usually wasplike or beelike (sawflies, ichneumons, winged ants, wasps, bees)………..The specimen is Hymenoptera (select the submit button to confirm your selection)
9.		Head prolonged ventrally into a beaklike structure (scopionflies)…………………..The specimen is Mecoptera (select the submit button to confirm your selection) Head not prolonged ventrally…………………….10
10.		Antennae very short and bristlelike; eyes large; abdomen long and slender (dragonflies, damselflies)………..The specimen is Odonata (select the submit button to confirm your selection) Antennae not short and bristlelike; eyes moderate to small………………11
11.		Hindwings broader than forewings; cerci present(stoneflies)…………..The specimen is Plecoptera (select the submit button to confirm your selection) Hindwings little if any broader than forewings; cerci absent……………..12
12.		Mothlike; wings noticeably hairy and opaque; antennae as long or longer than body (caddis flies)…………………..The specimen is Trichoptera (select the submit button to confirm your selection) Not mothlike; wings not noticeably hairy, usually clear; antennae shorter than body…………13
13.		Wings with few cross veins; tarsi 4-segmented; length to 8 mm (termites)………..The specimen is Isoptera (select the submit button to confirm your selection) Wings with numerous cross veins; tarsi 5-segmented; length to 75 mm (fishflies, dobsonflies, lacewings, ant lions)…………………The specimen is Neuroptera (select the submit button to confirm your selection)
14.		Mouthparts sucking, beak arising from rear of head (cicadas, hoppers, aphids)………..The specimen is Homoptera (select the submit button to confirm your selection) Mouthparts chewing, beak absent; body length less than 7 mm (book lice, bar lice)……….The specimen is Pscoptera (select the submit button to confirm your selection)
15.		Wings entirely absent………….16 Wings modified, forewings hard and leathery and covering hindwings…………..27
16.		Narrow-waisted, antlike (ants, wingless wasps)…………The specimen is Hymenoptera (select the submit button to confirm your selection) Not narrow-waisted or antlike………………17
17.		Body rarely flattened laterally; usually do not jump……………18 Body flattened laterally; small jumping insects (fleas)………The specimen is Siphonaptera (select the submit button to confirm your selection)
18.		Parasites of birds and mammals; body nearly always flattened dorsoventrally………19 Never parasitic; body usually not flattened…………20
19.		Head as wide or wider than thorax (chewing lice)………………The specimen is Mallophaga (select the submit button to confirm your selection) Head narrower than thorax (sucking lice)……………………The specimen is Anoplura (select the submit button to confirm your selection)
20.		Abdomen with stylelike appendages or threadlike tails (silverfish, bristletails)…………….The specimen is Thysanura (select the submit button to confirm your selection) Abdomen with neither styles nor tails………..21
21.		Abdomen with a forked tail-like jumping mechanism (springtails)………The specimen is Collembola (select the submit button to confirm your selection) Abdomen lacking a jumping mechanism……….22
22.		Abdomen usually with two short tubes; small, plump, soft-bodied (aphids, others)………….The specimen is Homoptera (select the submit button to confirm your selection) Abdomen without tubes; usually not plump and soft-bodied………………23
23.		Lacking pigment, whitish; soft-bodied………24 Distinctly pigmented; usually hard-bodied…………25
24.		Antennae long, hairlike; tarsi 2-segmented or 3-segmented (psocids)……….The specimen is Psocoptera (select the submit button to confirm your selection) Antennae short, breadlike; tarsi 4-segmented (termites)…….The specimen is Isoptera (select the submit button to confirm your selection)
25.		Body shape variable; length over 5 mm………….26 Body narrow; length less than 5 mm (thrips)……………The specimen is Thysanoptera (select the submit button to confirm your selection)
26.		Antennae 4-segmented or 5-segmented; mouthparts sucking (wingless bugs)……..The specimen is Hemiptera (select the submit button to confirm your selection) Antennae many-segmented; mouthparts chewing (some cockroaches, walkingsticks)…………The specimen is Orthoptera (select the submit button to confirm your selection)
27.		Abdomen with forcepslike cerci (earwings)…………The specimen is Dermaptera (select the submit button to confirm your selection) Abdomen lacks forcepslike cerci……….28
28.		Mouthparts sucking; beak usually elongate……………29 Mouthparts chewing…………………30
29.		Forewings nearly always thickened at base, membranous at tip; beak rises from front or bottom of head (true bugs)……………..The specimen is Hemiptera (select the submit button to confirm your selection) Forewings of uniform texture throughout; beak arises from hind part of head (hoppers)……..The specimen is Homoptera (select the submit button to confirm your selection)
30.		Forewings with veins, at rest held rooflike over abdomen or overlapping (grasshoppers, crickets, cockroaches, mantids)……..The specimen is Orthoptera (select the submit button to confirm your selection) Forewings without veins, meeting in a straight line down back (beetles)………….The specimen is Coleoptera (select the submit button to confirm your selection)