43 
front of the head is hollowed out in a furrow about the size of a hair. 
The insect will often be found adhering by the mouth parts with 
a hair so closely held in this groove that it is somewhat diiiicult to 
tell where the hair begins as separate from the insect. 
There is no record that we have seen that indicates its presence 
on any other animal than the domestic cat, and, judging by our 
own observation, it is only occasionally that cats become infested 
with it. When they do the usual remedies may be administered, es- 
pecially a washing with kerosene emulsion, after which the animal 
should be allowed to dry in a warm place, as the fur is so fine that they 
dry slowly. 
THE BITING LOUSE OF THE DOG. 
(Trichodectes latas Nitzsch.) 
Something over a century ago DeGeer mentioned a species of parasite 
ou the dog under the name of Ricinuscanis, which prob- 
ably referred to this species, and another mention by 
Olfers under the name of Pediculus setosus probably 
preceded the description by Nitzsch under the name 
which the insect has borne since 1818. 
Probably every one who has had much to do with 
dogs is aware to what an extent this parasite may mul- 
tiply and how troublesome it is to this friend of man. 
It is generally believed that the lice are more trouble- FlG K 
some to puppies than to old dogs, and it is not at all lotus. (After Denny.) 
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 
millimetre, 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. 
THE LOUSE OF THE BEAR. 
(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 cer- 
tain class of people, it seems proper to introduce mention of its com- 
mon parasite here. The species was described by Nitzsch, and appar- 
ently later authors have done little more than quote his description. 
To what an extent bruin suffers from the company of his gue8ts we arc 
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 sub- 
quadrangular. It is nearly 2 millimetres in length. 
