272 



ZOOLOGY 



Biting lice 



True lice 



with imperfect metamorphosis, and are remarkable for 

 their social life in large colonies. The anterior and 



posterior wings are similar 

 to one another. 



Order Corrodentia 



The book lice ' (which 

 are not lice) and their rela- 

 tives ; very small insects 

 with long, slender antennae 



From Bulletin 67, u.s. National Museum and incomplete metamor- 



FIG. 86. A "tree louse," Psocus venosus phosis. In One group the 



(Corrodentia) . 



wings are well developed, 



in another group they are absent. 



Order Mallophaga 



Biting lice, abundant on birds, though some genera 

 infest mammals. They are wingless. 



From Bulletin 67, U. S. National Museum 



FIG. 87. A bird louse, Goniodes faki- 



cornis (Mallophaga). 



From Bulletin 67, U. S. National Museum 

 FIG. 88. A head louse, Pediculus capitis 

 (Siphnnculata) . 



Order Siphunculata 



The true lice, including those infesting man. 

 mouth is beaklike, adapted for sucking. 



The 



