60 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. (Coccidtz.) 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. 



C JC. 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 trunk ; palpi present. Page 83 DIPTERA. 



DD. Prothorax well developed. 



E. Body strongly compressed ; tarsi five-jointed. (Fleas.} Page 



84 SlPHONAPTER A. 



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

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

 parts forming a triangular, unjointed beak ; palpi present. 



Page 74 PH YSOPODA. 



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 horny, without veins. Hind legs not fitted for 



jumping. Page 85 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 EPHEMERIDA. 



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



HEMIPTERA. 



DD. Abdomen without caudal filaments. Halteres in place of 

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



DIPTERA. 



