HEXAPODA. 79 



EE. Body not compressed; tarsi one-, two , or three-jointed. 



F. Last joint of tarsi bladder-like or hoof-like in form and 



without claws ; mouth-parts forming a triangular, un- 



jbinted beak ; palpi present, p. 119 PHYSOPODA. 



FF. Last joint of tarsi not bladder-like, and furnished with 

 one or two claws ; mouth-parts forming a slender, usually 

 jointed beak; palpi apparently wanting, p. 121. 



HEMIPTERA. 

 AA. Winged. (The wing-covers, elytra, of beetles and of earwigs are 



counted as wings in this table.) 

 B. With two wings. 



C. Wings horny, leathery, or parchment-like. 



D. Mouth-parts formed for sucking. Wings leathery, short- 

 ened, or membranous at the tip. p. 121 HEMIPTERA. 



DD. Mouth-parts formed for biting. Jaws distinct. 



E. \Vings horny, without veins. Hind legs not fitted for 



jumping, p. 494 COLEOPTERA. 



EE. Wings' parchment-like, with a network of veins. Hind 



legs fitted for jumping, p. 104 ORTHOPTERA. 



CC. Wings membranous. 



D. Abdomen with caudal filaments. Mouth-parts rudimentary. 



E. Hakeres wanting, p. 86 EPHEMERIDA. 



EE. Halteres present (males of Coccidce). p. 121. HEMIPTERA. 



DD. Abdomen without caudal filaments. Halteres in place of 



second wings. Mouth-parts formed for sucking, p. 413. 



DIPTERA. 

 I>B. With four wings. 



C. The two pairs of wings unlike in structure. 



D. Front wings leathery at base, and membranous at tip, often 

 overlapping. Mouth-parts formed for sucking, p. 121. 



HEMIPTERA. 

 DD. Front wings of same texture throughout. 



E. Front wings horny or leathery, being veinless wing- 

 covers. (Elytra) 

 F. Abdomen with caudal appendages in form of movable 



forceps, p. 102 EUPLEXOPTERA. 



FF. Abdomen without forcep-like appendages, p. 494. 



COLEOPTERA. 



EE. Front wings leathery or parchment-like, with a network 

 of veins. 



F. Under wings not folded. Mouth-parts formed for suck- 

 ing, p. 121 HEMIPTERA. 



