264 INSECTS AFFECTING DOMESTIC ANIMALS. 



it in thoroughly with the finger tips at the same 

 time. It kills the lice and leaves the hair of the an- 

 imal in good condition. The lice may also be de- 

 stroyed by treating with a strong tobacco decoction 

 — a pound of tobacco being boiled in two gallons of 

 water — or a wash of carbolic acid soap. But the 

 first named remedy is best. 



The Horn Fly. 



Haematobia scrrata. 



This is an imported insect which has lately 



attracted much attention in the Eastern States. It 



is called the Horn Fly because of the peculiar habit 



the flies have of gathering in clusters upon the base 



Fig. 138: a, Horn Fly, magnified ; 6, cow-horn with band of rest- 

 ing flics, reduced. 



of the horn, as represented at Fig. 138, b. They 

 light here to avoid being disturbed by the heads or 

 tails of the cattle, but do not pierce the horn or do 

 any serious injury to it. On the body, however, 

 where they light when feeding, they insert their 

 beaks into the skin, injecting at the same time a little 

 poisonous secretion which causes irritation and in- 

 flammation, and a flow of blood to the spot. This 



