INSECTS INJURIOUS TO DOMESTIC ANIMALS, ETC. 667 



augur and put salt in the holes. Around each hole smear a quantity 

 of tar. Sheep seeking salt will get the tar on their noses and be 

 protected in a measure as long as it remains. 



It is difficult to rid the sheep of the maggots once they have 

 become established. In their early stages they may be reached 

 by injection through the nostrils but later this is not practical. 

 It should be done at any time under the advice of a veterinarian. 



Lice of Live Stock * 



There are two general groups of lice which may affect live- 

 stock, These are the biting lice, Mallophaga, which feed on hair, 

 scales from the epidermis and other waste on the animal, but are 

 irritating to the animal and cause poor general condition, and the 

 true lice or sucking lice, 

 Siphunculota which suck 

 blood from the host. 



Biting Lice t 



There are several species 

 of biting lice to be found on 

 domestic animals. Aside 

 from the ones on poultry 

 the most common are the 

 biting lice of cattle (Tricho- 

 dectes scalaris). These are 

 small whitish forms about 

 one-sixteenth of an inch in 

 length and of the general 

 form shown in the illustra- 

 tion. 



A similar species occurs 



on the horse. It may be FlQ 586 ._ The bit ing louse from cattle, 

 a trifle larger and lighter U. S. Dept. of Agr. 



in color but otherwise will appear just as the cattle louse. Its 

 specific name is T. parwnpilosus. Biting lice on other live stock 

 are more rare, but may occur. 



* See Marion Imes, Farmers' Bulletin 909, U. S. Dept. of Agr. 

 f Mallophaga. 



