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SCHOOL ENTOMOLOGY 



121. Cattle Lice. Two or three species of lice commonly 

 affect neglected cattle and one inhabits hogs. Of these the 

 first three belong to the true lice. * The most common is the 

 so-called Short-nosed Ox Louse. f It is a bluish or dark gray 

 color, about one-sixth of an inch long, and of the general 

 shape shown in Fig. 140. These lice frequent the neck and 

 shoulders of cattle, which sometimes become badly rubbed 



FIG. 140. Short-nosed ox-louse (Hcematopinus eurysternus}. (U. S. 



Dept. Agr.) 



a, female; b, rostrum; c, ventral surface of the last segments of male; d, same 

 of female; e, egg; /, surface of same greatly enlarged. 



by their efforts to be rid of them. The eggs are laid upon 

 the hair near the skin, and the young resemble the adults 

 in both structure and habits. Ths Lony-nosed Ox Louse J is 

 very similar, except that the snout is more prolonged, but 

 it does not seem to be so injurious. Another somewhat 

 larger species of the same genus affects hogs. It is about 



* Siphunculaia, see page 37. 



f Hcematopinus eurysternus Nitzsch. 



% Hcematopinus vituli Linn. 



Hcematopinus urius Nitzsch. 



