268 ELEMENTARY ZOOLOGY. 



Anterior very thick and horny.; posterior folding length- 

 wise and crosswise beneath Order Coleoptera. 



Wings nearly alike in structure. 



Many veins (nerves) in the wings Order Neuroptera. 



Few veins in wings Order Hymenoptera (in part) . 



Mouth parts suited for piercing and sucking. 

 Two pairs of wings. 



Wings unlike; front pair leathery at base, 



Order Hemiptera (in part). 

 Wings alike. 



Covered with powdery scales Order Lepidoptera. 



Membranous wings; not covered with scales, 



Order Hemiptera (in part). 



One pair of wings Order Diptera. 



Wingless: degenerate types of several orders. 

 Mouth parts suited for both biting and sucking; four transparent 

 wings; front and rear wings fastened by hooks, and thus acting 

 together . Order Hymenoptera. 



282. Key to Some of the Common Orthoptera. 

 Legs similar; body flat; good runners, 



Family i, Blattidce (roaches). 



Small brown species Croton bug. 



Large black species Cockroach. 



Legs similar ; body slender ; slow crawlers .. Family 2, Phasmidce 



(walking-stick insects) . 

 Legs unequal; third pair longer; jumpers. 



Antennae shorter than the body. Family 3, Acrididte (locusts). 



Medium size, with reddish legs Red-legged locust. 



Large; hind wings edged with yellow Carolina locust. 



Antennae longer than the body. 



Ovipositor sword-shaped Family 4, Locustidce. 



Small ; green ; in meadows Meadow-grasshopper. 



Large; tree dwellers; green Katydids. 



Small; brown and wingless; under stones, etc., 



Cricket-grasshopper. 

 Ovipositor awl-or spear-shaped ; brown or black, 



Family 5, Gryllidce (crickets). 



283. Key to Some Common Neuroptera. 



Living in communities in wood or earth ; bodies white . Termites 



(white ants). 



