1 62 



DISEASES OF SWINE 



ments. The general color of the louse is gfay, 

 with the margins of the head, thorax, and abdomen 

 dark. 



The eggs are found in large numbers attached 

 to the hair in the region of the ears, shoulders, 

 and thighs. They are slightly yellowish or dusky 

 white in color, somewhat oval in shape, tapering 

 toward the point of attachment and large at the 



FIG. l6— A HOG LOUSE AND HAIR WITH EGGS ATTACHED 



free end, the lid of which is forced open by the 

 young louse when it is ready to leave the egg. 

 The period of hatching is probably from one to 

 three weeks. 



Source of Infection. — This pest is widely dis- 

 tributed. Hogs become infested by coming in con- 

 tact with lousy hogs, or when kept in pens and 

 hog houses that have been occupied by such ani- 



