IfV 
Issued Septembers, 1910. 
U. S. DEPARTMENT OF AGRICULTURE, 
BUREAU OF ANIMAL INDUSTRY— BULLETIN NO. 39. 
A. D. MELVIN, Chief of Bureau. 
INDEX-CATALOGUE 
MEDICAL AID VETERINARY ZOOLOGY 
PART 31. 
[Authors: Thooris to Utz.] 
BY 
CH. WARDELL STILES, Ph. D., 
Consulting Zoologist, Bureau of Animal Industry; Professor of Zoology, 
U. S. Public Health and Marine-IIospital Service, 
AND 
ALBERT HASSALL, M. R.C. V. S., 
Assistant Zoologist, Bureau of Animal Industry. 
^^POsitORY 
WASHINGTON : 
GOVERNMENT PRINTING OFFICE. 
igiO. 
