204 INSECTS AFFECTING DOMESTIC ANIMALS. 
Probably everyone who has had much to do with dogs is aware to 
what an extent this parasite may multiply and how troublesome it is 
to this friend of man. It is generally believed that the lice are more 
troublesome to puppies than to old dogs, and it is not 
at all unlikely that the insects migrate when possible 
from older to younger animals. 
In color this species agrees pretty closely with the 
other species, and it is of about the same length as 
the cat louse, a little more than 1 mm., but it is much 
broader in proportion, being more than half as wide as 
long, and the head is short and the front but slightly 
curved. 
Fig. 127.--Trichodectes THE LOUSE OF THE BEAR. 
latus —enlarged 
(after Denny). ( Trichodectes pinguis Nitzsch. ) 
Inasmuch as the common brown bear has been to a considerable 
extent domesticated, and indeed furnishes a means of support to a 
certain class of people, it seems proper to introduce mention of its 
common parasite here. The species was described by Nitzsch, and 
apparently later authors have done little more than quote his descrip- 
tion. To what an extent bruin suffers from the company of his guests 
we are not aware, but they probably multiply upon him as on other 
animals and cause him the same amount of annoyance. 
It is described as characterized by the form of the head, which is 
subquadrangular. It is nearly 2 mm. in length. 
THE LOUSE OF THE LLAMA. 
( Trichodectes breviceps Rudow.) 
In some parts of South America the llama is a very important domes- 
tic animal, and consequently this parasite has a place with the other 
species included in this work. 
This species was described by Rudow in 1866, but as we have not 
seen specimens we must leave it with the mere mention. It is said to 
be 1 mm. in length, and doubtless agrees closely with the other species 
of the genus in appearance. | 
THE LOUSE OF THE GOAT. 
( Trichodectes climax Nitzsch. ) 
Since this species was described by Nitzsch in the early part of the 
present century it does not seem to have received very frequent notice, 
and Denny does not appear to have found it in England. 
It is described as having the head wider than long, quadrangular in 
Shape, and the body in the female nearly two-thirds as wide as long, 
the length being about 14 mm. 
