Cipal Orders Of Insects

i Wings absent, or front wings thickened and concealing membranous hind wings (see back endpaper)

Antennae very short and bristlelike; ' eyes large ODONATA, p. 68

Head prolonged ventrally to form beak-/ like structure MECOPTERA, p. 208

Head not prolonged ventrally

Hind wings broader than front wings; cerci present

PLECOPTERA, p. 92

Not mothlike; wings not hairy, usually clear; antennae generally shorter than body

Wings with few cross veins; tarsi 4-segmented; length to 8 mm. ISOPTERA, p. 88

Mouth parts chewing, beak absent; length 7 mm. or less

PSOCOPTERA, p. 102

Mouth parts chewing, beak absent; length 7 mm. or less

PSOCOPTERA, p. 102

Antennae very short and bristlelike; ' eyes large ODONATA, p. 68

Head not prolonged ventrally

Hind wings broader than front wings; cerci present

PLECOPTERA, p. 92

Not mothlike; wings not hairy, usually clear; antennae generally shorter than body

Antennae not short and bristlelike, eyes moderate to small

Hind wings little if any broader than front wings; cerci absent

Mothlike; wings hairy and opaque; antennae as long as body or longer TRICHOPTERA, p. 210

" Wings with numerous cross veins; tarsi 5-segmented; length to 75 mm. NEUROPTERA, p. 140

PICTURED KEY TO THE PRINCIPAL Wings entirely absent m > > < »

PICTURED KEY TO THE PRINCIPAL Wings entirely absent m > > < »

Body flattened laterally; small jumping insects SIPHONAPTERA, p. 308

Body rarely flattened laterally; usually do not jump

Never parasitic; body usually « not flattened

Body flattened laterally; small jumping insects SIPHONAPTERA, p. 308

Body rarely flattened laterally; usually do not jump

Parasites of birds or mammals; body nearly always flattened dorsoventrally

Never parasitic; body usually « not flattened

Head as wide as or wider than thorax MALLOPHAGA, p. 106

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