THE LICE 77 



asites of the order Diptera. Pediculosis, properly so called, is seldom 

 met with in sheep. While the sucking lice are locaUzed to the lower 

 parts of the legs, the biting lice lie deep in the wool, close to the body, 

 seriously altering the fleece by cutting the fibers with 

 their mandibles. Their location makes the condition 

 rather a difficult one to contend with. 



Pediculosis of the Goat 



Goats have one suctorial species, — Linognathus stenop- 

 sis. The biting louse, — Trichodedes climax, is fairly com - 

 mon and is the only species of this genus upon goats that 

 is well estabhshed. ^ , , _, . 



Fig 44 — X n- 



1. Linognathus stenopsis (Hsematopinus stenopsis). chodectes spha- 

 Pediculidse (p. 70). — Head long, narrow, and rounded in rocephalus (af- 

 front; there are two lateral notches, below which are ter Osborn Bui. 



■ 1 1 T-. Ill -11 ■'^°- °' Bureau 



Widened temples. From these the head narrows rapidly of Entomology, 

 and becomes deeply fitted into the thorax. The thorax u. s. Dept. of 

 is widest posteriorly where it is somewhat concaved upon ^'^''' 

 the abdomen. The abdomen in outline is an elongated oval with stig- 

 mata near lateral margins of segments. The female is 2 mm. ; the male 

 L5 mm. in length. 



2. Trichodectes climax. Philopteridse (p. 71). — Head quadrangular 

 in shape and broader than long. The abdomen is oval with median 

 dark bands upon the segments. The head and thorax are reddish 

 brown; the abdomen is pale yellow. 



During the winter months especially, goats are apt to harbor lice in 

 rather large numbers. As in other animals the sucking louse produces 

 the greater irritation. The skin may become bare in places with numer- 

 ous inflamed and ulcerated areas covered with crusts. In Angora goats 

 especially, the biting louse causes a great depreciation from its habit of 

 cutting the hairs with its mandibles. 



Pediculosis of the Hog 



Domesticated and wild hogs have one species of louse, Hcematopinus 

 suis (H. urius). This is the largest known member of the suctorial 

 group. The head is very long and narrow, cone-shaped, and rounded 

 in front; just posterior to the attachments of the antennae are horn-like 

 protuberances, forming deep notches. The thorax is somewhat broader 

 than long; dark, transverse bands may be noted upon the legs. The 

 abdomen is oval in outline, with distinct segment borders; the stigmata 

 are upon prominent lateral protuberances. The thorax is brownish 

 red in color; the head and abdomen yellowish gray. The female is 5 

 mm.; the male 4 mm. in length (Fig. 45). 



This louse is a very active blood sucker, living upon hogs of any age 



