16 
both plants belonging to the genus Delphinium. Washes of carbolie 
acid soap or of tobacco infusion are also effectual, but washes of any 
kind are of course illy adapted to use in midwinter, the time when there 
is frequently most necessity for treatment. Mercurial ointment, sulphur, 
or tobacco smoke, kerosene and lard, or kerosene emulsion, road dust, 
ashes, etc., may be resorted to, according to the circumstances. In- 
fested animals should, if possible, be placed apart from the others, and 
much trouble may be saved by this precaution. 
Experiments with fumigation have shown this to be a method avail- 
able when other plans are undesirable, though from the equipment 
necessary, and the fact that it requires some time in application, it 
may not prove of as general service as the washes. 
The method may be said in brief to consist of a tight box-stall just large 
enough to admit the largest animals to be treated, one end having a 
close-fitting door to admit the animal, the opposite end a stanchion in 
which the animal is fastened, and covering the open part of this 
end, and made to fit tightly around the head just in front of the horns, 
is a canvas sack open at both ends, the inner one nailed to the stall and 
the outer with a running cord to draw it down to the animal’s head, thus 
leaving the eyes and nose in open air. An opening at the bottom of 
one side admits the fumigating substance, sulphur or tobacco, the lat- 
ter apparently the most effective. 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 should be burnt, however, with coals or 
by 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. Pyre- 
thrum might be better even than tobacco. 
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 associated. 
THE LONG-NOSED OX-LOUSE. 
(Hematopinus vituli Linn.=tenuirostris Burmeister.) 
In connection with the preceding species this louse, as already stated, 
has long been familiar to ecattlemen; it has also been known to ento- 
mologists for a considerable time, but its history from the entomological 
side is not entirely clear. It seems to have been first technically de- 
scribed by Linnzeus under the name of Pediculus vituli, which name has 
been followed 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 generally. Nitzsch described it 
0 at 2 a yh Mi ee eee A ae LS RE a a i tl et < a 
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