LICE WHICH AFFECT DOMESTIC ANIMALS 349 



Osborn, Herbert, 1896. — Insects affecting domestic animals. U. S. Dept. 



Agr., Div. Ent., Bull. 5, pp. 1-302. 

 Stevenson, E. C, 1906. — The external parasites of hogs. U. S. Dept. 



Agr., Bur. Anim. Ind., Bull. 69, pp. 1-44. 

 Watts, H. R., 1918.— The hog louse. Tenn. Agr. Exp. Sta., Bull. 120, 



pp. 1-15* 



