LICE — TICKS — MITES 



375 



For all of these pests, treatment consists in the application of suit- 

 able contact insecticides, which may be kerosene emulsion, tobacco 

 extract, or various ointments. Kerosene emulsion 

 should be prepared by diluting the stock emulsion 

 with 8 or 10 parts of water. '' Black leaf 40," or 

 '' nicotine sulphate," is diluted at the rate of 1 part 

 to 800 of water. 



Biting Lice on Domestic Animals 



Various species of flat-bodied, broad-headed, 

 biting lice infest the larger animals. They feed 

 on the rough parts of the skin and on the hairs, 

 and cause considerable irritation, though they do 

 not suck the blood. Commonly they are spoken 

 of as the " little red lice," as distinguished from 

 the bluish sucking lice. All are members of the 

 genus Trichodedes. T. scalaris Nitz. infests cattle ; 

 Piag. is common on the horse; 

 the sheep. 



Washes of kerosene emulsion or tobacco extract are effective, as 

 described for sucking lice. 



Fig. 601.— The 

 Long-nosed Ox 

 Louse. Enlarged 

 and natural size. 

 Original. 



T. parumpilosiis 

 T. spfuerocephalus Nitz. is found on 



The Cattle- tick (Margaropus annulatus Say) 

 Throughout many of the Southern states cattle are subject to a 

 fever which is transmitted by a tick. Enormous losses are caused 

 each year by the work of this pest. The tick 

 which serves as a carrier for this disease is a 

 dark-bodied, eight-legged creature, and goes 

 through a peculiar life round. The adult 

 engorged female drops from the cattle to the 

 ground and lays its eggs. These hatch into 

 ''seed ticks," which then crawl up on the 



nearest herbage and wait for cattle to come 

 Fig. 602. — The Cattle- , ^ , i • , i x ^u 



tick. Shghtly enlarged. ^^^^^- ^^^^ ^ack on an animal host, they 

 Original. go through their Ufe round to adult. 



