UNITED STATES DEPARTMENT OF AGRICULTURE 

 BULLETIN No. 329 



Contribution from the Bureau of Entomology 

 L. O. HOWARD, Chief 



Washington, D. C. 



PROFESSIONAL PAPER 



March 6, 1916 



NOTES ON FIVE NORTH AMERICAN BUFFALO 

 GNATS OF THE GENUS SIMULIUM 



By 

 ARTHUR W. JOBBINS-POMEROY, Entomological Assistant 



CONTENTS 



Page 



Introduction 1 



The Adult Stage 2 



The Egg Stage 11 



The Larval Stage 12 



The Pupal Stage 23 



Page 

 Life Cycle and Number of Generations . 26 

 Insect Enemies and Parasites .... 27 

 Slmulium as a Possible Carrier of Dis- 

 ease 28 



Bibliography 35 



WASHINGTON 



GOVERNMENT PRDXTING OFFICE 



1916 



