2i 8 Bugs, Cicadas, Aphids, and Scale-insects 
also of cattle, is about J inch long and not more than -J- as wide, with long 
slender head, narrow in front; H. urius (Fig. 305), of hogs, is J inch long, 
being one of the largest of the sucking-lice, with broad abdomen and long 
head, and gray in color, with the lateral margins of head, thorax, and abdo- 
Fig. 304. Fig. 305. 
Fig. 304. —Short-nosed cattle-louse, Hcematopinus eurysternus. (After Lugger; natural 
length 1.5 mm.) 
Fig. 305. —The hog-louse, Hcematopinus urius. (After Lugger; natural size indicated 
by line.) 
men black; H. pedalis, the sheep-foot louse, found only on the legs and 
feet of sheep, below the long wool, has a short, wide head and same general 
shape as the short-nosed ox-louse; H. asini, of horses, of about same size 
as the short-nosed ox-louse, but with long and slender head with nearly 
parallel sides; H. spinulosus , of the rat, small, light yellow, and with the 
head projecting very little in front of the antennae and the thorax very short; 
H. acanthopus , of the field-mouse, resembling the rat-louse in color and 
shape, but larger; H. ventricosus , of rabbits and hares, thick-bodied and 
short-legged and with abdomen nearly circular; H. antennatus , of the 
fox-squirrel, with long slender body and curious curved tooth-like process 
on basal segment; H. sciuropteri , of the flying squirrel, with slender light- 
yellow body, and head as broad as long, and with front margin nearly 
straight; H. suturalis, of the ground-squirrels and chipmunks, with short 
broad golden-yellow body. The eggs of all these forms are glued to the 
hair of the hosts, the young louse escaping by the outer or unattached end 
and immediately beginning an active blood-sucking life. The most effective 
