CATTLE LICE AXD HOW TO ERADICATE THEM. 5 



long. The males are slightly smaller than the females. The head 

 is short, nearly as broad as long, and is bluntly rounded in front. 

 The head and thorax are yellowish brown, while the abdomen is blue 

 slate colored. 



These lice pass the various stages of their life on the animal. The 

 eggs, commonly called "nits," are attached firmly to the hairs, 

 usually close to the skin, and they hatch on the animal in 11 to 18 

 days, the average period of incubation during mild weather being 

 about 14 clays. The young females begin to lay eggs when they are 

 about 1'2 days old. 



The long-nosed cattle louse (Linognathus rituli, fig. 2) usually is 

 found on calves and young stock, but sometimes occurs on mature 

 cattle. Although 



in their adult ^^^RSBHSte^fc^ 



stage these lice 

 have about the 

 same general color 

 as the short-nosed 

 lice, the two spe- 

 cies may be dis- / 

 tinguished easily. / 

 As implied by the 

 term "long-nosed." 

 the head is long 

 and slender, and 

 the body is only N 



about one-third as ^^^^^ 



broad as long, 

 thus giving the 

 e n tire body a 

 more slender ap- 

 pearance than that 



FIG. 2. Long-nosed cattle louse (Linognatlnts rituli). Female. 

 01 the sllOrt-nOSetl (Magnified about 20 times.) 



species. 



These lice pass their entire life on the animal and deposit eggs 

 in the same general manner as the other species. The eggs hatch 

 in 10 to 1-t days, the average period of incubation being about 12 

 days. The young females reach sexual maturity and begin laying 

 eggs about 11 days from the date of hatching. 



BITING LICE. 



The common biting lice of cattle (Trichodectes scalaris, fig. 3) 

 are found on both young and mature cattle. They are much smaller 

 than the sucking lice, but are visible to the naked eye. The head is 

 broad and blunt, the color is reddish, that of the bodv commonly 



