Order Ephemeroptera: Elongated abdomen with two or three tail filaments. Two pair of membrane wings bristle-like antennae Mayflies Order Odonata: Elongated membranous wings Long, slender abdomen Large compound eyes occupy most of head. Dragonflies Order Phasmida: Stick-like body Wings usually absent Walking stick, leaf insects

Order Orthoptera: Long forewing Leathery hind wing Chewing mouthparts Grasshoppers, Crickets Order Mantodea Long thorax Legs long and armed with strong spines Mantids Order Blatteria Flattened oval body Head shielded from above Cockroach

Order Isoptera Workers white and wingless Abdomen broadly joined to thorax Social Termite Order Dermaptera Elongate body Chewing mouthparts Threadlike antennae Earwigs Order Phthiraptera Small and wingless Ectoparasites of birds and mammals Body dorsoventrally flattened Lice

Order Hemiptera Sucking mouthparts originate from ventral head Proximal (near center of body) hardened Distal (away from center) membrane True Bugs Order Homoptera Wings membrane Mouthparts ventral posterior Cicadas, leafhoppers, aphids, scale insects

Order Thysanoptera Small bodied Sucking mouthparts Wings narrow and fringed Thrips Order Neuroptera Membrane wings Hindwings cover body Lacewing, dobsonfly Order Coleoptera Forewings covers Hindwing membrane Chewing mouthparts Largest insect order Beetles

Order Trichoptera Mothlike Fringed antenna Chewing mouthparts Build cases Caddisfly Order Lepidoptera Wings broad, covered with scales Sucking mouthparts Moth, Butterfly Order Diptera Front wing developed Rear wing reduced Never chewing mouthparts Flies

Order Siphonoptera Laterally flattened Sucking mouthparts Jumping legs Fleas Order Hymenoptera Wings membrane Well developed ovipositor Some modified into stinger Biting, lapping mouthparts Social Ants, Bees, Wasps