HANDBOOK OF MEDICAL 

 ENTOMOLOGY 



WM. A. RILEY, PH.D. 



Professor of Insect Morphology and Parasitology, Cornell University 

 and 



O. A. JOHANNSEN, PH.D. 



Professor of Biology, Cornell University 



ITHACA, NEW YORK 



THE COMSTOCK PUBLISHING COMPANY 

 IQI5 



