U.S. Dept. of Agriculture, Diseases of the Horse. 
PLATH XXXIxX. 
Sarcoptes SCABLEL, Vas: gue. Chartoples spathiferus 
Pscroples Equi. Dermanyssus gallnae 
Hates del alter Meviin 
MIEVES THAT INFEST THE HORSE. 
