ARACHNIDA. 261 
THE Doc Tick oR Woop TIck. 
(Dermacentor americanus Linn.) 
The most common tick through the Northern States, at least, is the 
so-called dog tick, the name being associated with its most common 
host. It occurs, however, very frequently on other animals and on 
man. When fully gorged, the ticks are nearly half an inch long, and 
they seem to favor the ears of dogs, or at least parts near the head. 
The males, fig. 153, do not enlarge like the females, but are about the 
size of the females before engorgement, and the body above as well as 
the borders of the legs are marked with bright, silvery lines and 
blotches, as shown in the figure. 
As with other species, the young climb to the outer parts of leaves, 
from whence they are readily brushed to the bodies of passing animals. 
THE LONE STAR TICK. 
* (Amblyomma unipuncta Pack.) 
This species, next to the cattle tick, is probably of the most impor- 
tance in the Southern States, sharing with that species the hospitality 
of cattle and also attacking 
other domestic animals. It 
is thought probable that, 
like bovis, it may convey 
Texas fever. 
It is easily known by the 
single bright, silvery spot 
on the back. When fully 
gorged, the female is about 
equal to the cattle tick in 
size. 
Measures of treatment will 
be the same as for that 
species. 
THE RABBIT TICK. 
Fia. 154.—Rhiphistoma leporis: a, ventral view of mouth 
parts; b, tarsus—enlarged (original). 
( Rhiphistoma leporis.) 
This is a rather common species on rabbits, and is found perhaps 
more commonly in the ear than elsewhere on the host animal. Itisa 
small species, and the figure will indicate its form. 
—/- 
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