THE CATTLE-TICK. 91 
ing May and June; they hatch early in July, the ‘‘shell open- 
ing like a clam.”’ 
Ticks are quite numerous in Minnesota, but only in the 
south do they become extremely troublesome to persons and 
animals. 
THE CATTLE-TICK. 
(Boophilus bowis Ril. ). 
This is a flat, leathery, reddish and seed-like species with 
an oblong oval body (fig. 57). When mature it reaches 
nearly half an inch in length. It doesnot occurin Minnesota, 

Fig. 57.—Cattle-tick. Enlarged. Original, 
but is a southern and, originally, a tropical species which is 
annually killed by frost north of the Ohio and Potomac 
rivers. Generally speaking, the injury caused by this gigan- 
tic mite, sucking the blood of animals, would be but small, if 
it were not for the fact that it is the chief and perhaps the 
only agent that spreads the ‘‘Texas Fever” or ‘Red Water.”’ 
This disease is caused by a microbe which enters the veins 
and arteries of cattle and rapidly and extensively destroys 
the red corpuscles of the,blood. The cattle-tick, which sucks 
