QL 



596 



H8R532 



1920 



ENT 



Studies on the Biology of the Aquatic Hydrophilidw. 



By E. Avery Richmond 



BULLETIN 



OP 



THE AMERICAN MUSEUM OF NATURAL HISTORY 

 Vol. XLII, Art. I, pp. 1-94 



New York 

 Issued SEP 21 m0 



SlUTflSOMAN LIBRAIY 



687 OF L. L. BUCHANAN 

 Ml 



UL- Buchan; 



