INSECTS AND THEIR NEAR RELATIVES 25 



TABLE FOR SEPARATING THE ORDERS OF INSECTS 



A. Wingless Insects. 



B. With biting mouth-parts. 



C. Mouth-parts poorly developed. Thysanura. 

 CC. Mouth-parts well developed. 



D. Parasitic on warm-blooded animals. Bird lice. 



Mallophaga. 

 DD. Not parasitic. 



E. Ant-like in general appearance. 



F. White, soft bodied, colonial. Termites. 



Isoptera. 



FF. Darker in color, bodies firm, in colonies or 

 solitary. Ants and some wasps Hymenoptera. 

 EE. Not ant-like in form. 



F. Very small, light in color, frequenting old 

 books and dry vegetable matter. Book lice. 

 Corrodentia. 

 FF. Larger species not occurring as above. 



G. Head prolonged into a beak. Boreus. 



Mecoptera. 

 GG. Head not prolonged into beak. 



H. Hind legs fitted for jumping. Wing- 

 less grasshoppers, etc. Orthoptera. 

 HH. Hind legs not fitted for jumping. 



I. Bodies and legs very long and 



slender. 



Walking sticks. Orthoptera. 

 II. Bodies not elongated. 



J. Bodies flattened. Lobes at tip 

 of abdomen. Roaches. Orthop- 

 tera. 

 JJ. Bodies variable but without lobes 



at tip of abdomen. Coleoptera. 

 BB. With sucking mouth-parts. 



C. Bodies covered with scale-like hairs. Wingless moths. 



Lepidoptera. 

 CC. Bodies not covered with hairs. 



