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, i 
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 
Fic. 601. — The 
Long-nosed Ox 
not suck the blood. Commonly they are spoken — Louse. Enlarged 
of as the “little red lice,’”’ as distinguished from and natural size. 
the bluish sucking lice. All are members of the Original. 
genus Trichodectes. T. scalaris Nitz. infests cattle; JT. parumpilosus 
Piag. is common on the horse; TJ. spherocephalus Nitz. is found on 
the sheep. 
Washes of kerosene emulsion or tobacco extract are effective, as 
described for sucking lice. 
The Cattle-tick (Jargaropus 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 
Fic. 602.—The Cattle 
tick. Slightly enlarged. ores 
Original. go through their life round to adult. 
along. Once back on an animal host, they 
