LICE AFFECTING DOMESTIC ANIMALS. 
203 
stance, sulphur or tobacco, the latter apparently the most ef¬ 
fective. In burning this we used a wire screen to spread the 
tobacco, placing this over a tin trough containing a small 
quantity of alcohol. It could be burnt, however, with coals 
or using a small quantity of kerosene. The time of exposure 
necessary will vary some with the strength of fumes, but one 
to two ounces of tobacco and exposure of 20 to 30 minutes 
was found effective. Pyrethrum might be better even than 
tobacco, f 
This species has been said to occur also on horses, but if 
this is the case it must be in rare instances, and there need 
be little apprehension of horses becoming infected with it 
by transmission from cattle with which they may be asso¬ 
ciated. 
The Long-Nosed Ox-Louse. (Plate I, Fig. 3.) 
Hcematopinus vituli , Linn.— tenuirostris , Burmeister. 
In connection with the preceding species this louse, as al¬ 
ready stated, has long been familiar to cattlemen; it has also 
been known to entomologists for a considerable time, but its 
history from the entomological side is not entirely clear. It 
seems to have been first technically described by Linnaeus 
under the name of Pediculus vituli , which name has been fol¬ 
lowed by Fabricius, Berkenhout, Stuart, and Turton, and, 
with the exception of the change in the generic name, by 
Stephens, Denny, and English and American authors gener¬ 
ally. Nitzsch describes it under the name of Pediculus oxy- 
rhynchus, which name was Latinized by Burmeister to ten¬ 
uirostris. This designation has been followed by Giebel and 
Piaget, but why the earlier name of Linnaeus was dropped we 
fail to discover. It seems more proper to retain the name 
given by Linnaeus. 
In this species the body is about one-eighth of an inch long 
and not more than one-third of that in width (see Fig. 3). 
The head is long and slender, the antennae set near the mid¬ 
dle each side; there is but a very slight protuberance behind 
the antennae and no eyes visible. The head sets well back 
into the thorax, forming an acute angle behind ; the thorax 
