262 INSECTS AFFECTING DOMESTIC ANIMALS. 



of the body. The destruction of the larvae in this 

 way may be effected by one or two applications in 

 autumn, and is the most satisfactory method of con- 

 trolling the pest." 



It is also frequently recommended to smear the 

 backs of the cattle during summer with fish oil, ker- 

 osene emulsion, or some similar substance, to pre- 

 vent the flies from depositing eggs, but this is a 

 much less practical method than that of destroying 

 the maggots, because the flies are present nearly all 

 summer, making it necessary that the application 

 be frequently renewed. 



Cattle Lice. 



There are three species of lice infesting cattle. 

 Two of these belong to the group of sucking lice and 

 the third is one of the biting lice. They are called 

 (1) the Short-nosed Ox-louse; (2) the Long-nosed 

 Ox-louse ; and (3) the Biting Ox-louse. 



The Short-nosed Ox-louse {Hsematopinus eurystcr- 

 nus) is represented consid- 

 erably magnified at Fig. 



Jo o 



137, a. Full grown females 

 of this species are one-sixth 

 of an inch long, and the 

 males are somewhat small- 

 er. The beak or rostrum 

 is provided with little 

 hooks by w T hich it may be firmly attached to the 

 skin, and within these hooks there is a slender suck- 

 ing tube having a piercing extremity which the 



Fig. 137. Lice 

 ox-lice ; c, 

 louse. Magnified. 



a, 6, sucking 

 biting horse- 



