182 INSECTS AFFECTING DOMESTIC ANIMALS. 
plate is kite-shaped, the anterior and posterior angles acute, the lateral 
angles rounded. The body is quite elongate, 
the posterior legs much larger than the ante- 
rior or middle ones. (Fig. 104.) 
The egg in this species, unlike those of other forms 
we have met, is attached to a bundle of hairs instead 
of to one, our specimen thus having attachment to 
four hairs, as shown in fig. 104. This would seem to 
be an excellent provision where the hair is so fine as 
in these animals. 
The egg is elongate oval, broad, and somewhat trun- 
cate at the attached end; the surface is roughened, 
rugulose, or foveolate, appearing squamous in places, 
and in section showing rounded pits on the surface; 
Fic. 104.—Heematopinus acantho. the investing substance at base is slightly corrugated. 
pus: a, dorsal view; b, head; c, (See fig. 104, e.) 
Bternal plate.) posteriorleg;e, The larva is much shorter and thicker in propor- 
egg—all enlarged (author's illus- " ; P 
nA tion than the adult, the spiny hairs of the abdomen 
wanting, but with one or two long, slender hairs ex- 
tending back from the terminal portion. 
LOUSE OF THE RABBIT AND HARE. 
(Hematopinus ventricosus Denny.) 
In this chapter, first published in Bulletin 7, it was stated that 
the rabbit louse had not been observed in this country; but shortly 
after specimens were received from Mr. A. Hassall, of Baltimore, and I 
have since taken the species on the prairie hare (Lepus campestris), 
and it most likely occurs on the various species of rabbits native to 
America. . 
It is a thick-bodied species, the abdomen almost globular, the legs 
quite short. It is not known from any other animals. 
LOUSE OF THE FLYING SQUIRREL. 
(Hematopinus sciuropteri Osb. ) 
Body slender, light yellow, head as broad as long, expanding laterally at the pos- 
terior border above and with an acute angle behind; beneath triangular and running 
back to a sharp angle between the anterior legs, the front projecting very slightly 
beyond the antenne, very slightly convex, the rostrum located back of the anterior 
border; the trophi plainly visible, passing back into the prothorax; the antenne 
very large and strong, first joint much the largest, occupying in its attachment half | 
the lateral margin of the head; second joint ordinary, third joint very short, but the 
anterior portion extending to more than usual length and appearing like a process 
and bearing a stiff hair and two or three tooth-like spines; the fourth joint attached 
apparently very near the base of the third on posterior side and of usual length; the 
fifth joint short, the terminal pit with two or three short hairs; the postero-lateral 
angles of the head armed with a long, stiff hair. 
Thorax widening from before backward, longer than its greatest width, lateral 
borders irregular, the posterior border concave; the sternal plate is very large, 
emarginate in front and a large emargination corresponding to each leg, deeply 
