21 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.iirius (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, thora.x, and abdo- 



FiG. 304. 



Fig. 305. 



Fig. 304. — Short-nosed cattle-louse, Hcmuitopinus eurysternus. (.^fter Lugger; natural 



length 1.5 mm.) 

 Fig. 305. — The hog-louse, Hitmatopinus urius. (.\ftcr 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 nearlv 

 parallel sides; H. spinulosiis, of the rat, small, light yellow, and with the 

 head projecting very little in front of the antennae and the thorax very short; 

 //. acanlliopits, of the field-mouse, resembling the rat-louse in color and 

 shape, but larger; H. venlricosus, of rabbits and hares, thick-bodied and 

 short-legged and with abdomen nearly circular; //. antennaliis, of the 

 fox-squirrel, with long slender body and curious curved tooth-like process 

 on basal .segment; H. sciuroplcri, 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 



