Fe INSECTS AFFECTING DOMESTIC ANIMALS. 
Head short, as wide as long, bluntly contracted in front of the antennz, with few 
hairs. Antenne large, annulate with reddish-brown, terminal joint with three or 
four bristles. Occiput merging into thorax, with prominent reddish oblique bands 
either side, becoming approximate on the thorax. Thorax wider than long, with 
anterior faint and posterior distinct band not meeting on median line of dorsum. 
Legs not differing markedly in size, but anterior smallest and posterior largest; mid- 
dle and posterior tibiz with very prominent, spoon-shaped process opposed to tarsal 
claw, marked with red-brown bands. e 
Abdomen oval, fusiform, thick, rising high above the thorax, sparsely set at base 
with irregularly scattered small hairs, those at margin a little longer and more regu- 
larly placed; spiracles inconspicuous, pleural, not marked by chitinous tubercles; 
brush organs on seventh segment rather small, L-shaped, the bristles on the end very 
small; terminal segment set with a cluster of small spines either side, ventrally. 
Male: Broader and flatter than the female. Two brownish lines on posterior ven- 
tral segments, converging to tip of abdomen; forked genitalia, showing through the 
transparent body wall. 
Eggs attached on hair of lower leg and foot a short distance from the skin, of 
about the usual form, rather long, surface shining, minutely punctured. 
Collected at Ames, Iowa, from domestic sheep (Ovis aries). These sheep had been 
recently imported from Canada. The lice did not occur on more than a few animals. 
THE SHORT-NOSED Ox LOUSE. 
(Hematopinus eurysternus Nitzsch.) 
This is probably the species that has been familiar from early time 
as the louse infesting cattle, though since this species and the following 
one have been generally confused, it is impossible to say which has 
been mostcommon. It was first accurately described by Nitzsch under 
the name of Pediculus ewrysternus in 1818 (Germar’s Mag., Vol. III, 
p. 305), and has received mention in every important treatise on para- 
sites since that date, as well as innumerable notices under the head of 
animal parasites, cattle lice, etc. As with other species, the disease 
produced has been termed phthiriasis, and as treated by Kollar and 
other writers, it has been recognized as a most serious pest and numer- 
ous remedies tried for its suppression. 
Since it has been very generally confused with the following species, 
we shall give more particular description and show as clearly as possi- 
ble how to distinguish them. The following quotation from Mr. C. W. 
Tenney (in Iowa Homestead for August 18, 1882) will show that this 
difference is not without interest or value as viewed by a practical 
breeder: “‘Then there is a blue slate-colored louse and a larger one of 
the same color that vary somewhat in their habits, and the last men- 
tioned is the hardest to dislodge.” Evidently it is the species under 
discussion to which Mr. Tenney refers as the “larger one.” It infests 
particularly the neck and shoulders, and these parts are frequently 
worn bare by the efforts of the animal to rid itself of the irritation pro- 
duced by these unwelcome visitors. Still, some cattlemen say that 
these parasites are of no consequence, and that they never pay any 
attention to them. 
The full-grown females are about one-eighth to one-fifth of an inch 
