6o INSECT LIFE. 



covering may be in the form of powder, of large tufts or plates, of 

 a continuous layer or of a thin scale, beneath which the insect 



lives. {Coccidce.) Page 75 Hemiptera. 



CC. Body more or less covered with minute scales, or with thick 

 long hairs. Prothorax not free (i. e., closely united with the meso- 

 thorax). Mouth-parts usually consisting of a long " tongue " 



rolled beneath the head. Page 80 Lepidoptera. 



CCC. Body naked, or with isolated or bristlelike hairs. . 



D, Prothorax not well developed, inconspicuous or invisible from 

 above. Tarsi five-jointed. Mouth-parts developed into an 



unjointed tnink ; palpi present. Page 83 Diptera. 



DD. Prothorax well developed. 



E. Body strongly compressed ; tarsi five-jointed. {Fleas.) Page 



84 SlPHONAPTERA. 



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

 F. Last joint of tarsi bladderlik© or hooflike at the tip ; mouth 

 parts forming a triangular, unjointed beak ; palpi present. 



Page 74 Physopoda. 



FF. Last joint of tarsi not bladderlike, and furnished with 

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

 jointed beak ; palpi apparently wanting. Page 75. 



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 parchmentlike. 



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



or membranous at the tip. Page 75 Hemiptera. 



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



E. Wings homy, without veins. Plind legs not fitted for 



jumping. Page S5 Coleoptera. 



EE. Wings parchmentlike, with a network cf veins. Hind legs 



fitted for jumping. Page 70 Orthoptera. 



CC. Wings membranous. 



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



E. Halteres wanting. Page 64 Epiiemerida. 



EE. Halteres present (males of Coccidce). Page 75. 



Hemiptera. 

 DD. Abdomen without caudal filaments. Halteres in place of 

 second wings. Mouth-parts formed for sucking. Page 83. 



Diptera. 



