TRUE LICE, 1g 
SUB-ORDER PARASITA. 
(True Lice). 
Since the sub-order Parasita has already been fully described 
in the Second Annual Report, it is only necessary to repeat the 
essential features. It includes certain parasites of man and mam- 
mals commonly known as lice. They are wingless insects, with 
Fic. 8.—Hog-louse, and grasping claw. 
Original. 
Fic. 7.—Mouth parts of body-louse; a, a, summit of head with bristles; b, b, the 
chitinous band; c, hind part of lower lip; d, d, protruding part of lower lip 
(haustellum); e, e, hooks turned outwards; f, inner tube of suction, with two 
pairs of jaws shown as lines on the outside, and a few drops of blood in the 
interior. Greatly enlarged. After Schicedte. 
a fleshy and unjointed beak, Fig. 7. Only one family (Pedi- 
culidz) occurs, which differs from the order of Mallophaga, or 
Bird-lice, in that it sucks the blood of its host, and does not eat 
its skin and feathers by means of a biting mouth. 
To show the form of true lice one species is given in the 
illustration, Fig. 8. In the report mentioned above many reme- 
dies were given to destroy the lice on domestic animals. Strong 
