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¬ 
jointed 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. 
A A. Winged. (The wing-covers, efy/rp, of beetles and of earwigs 
are wings.) 
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. Wings 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. Halteres 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. 
Dipt era. 
BB. 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. 
