Bulletin American Museum of Natural History 



[Vol. XLII 



Table of known life histories of aquatic Hydrophilidce 

 {American genera) 













Country 



Name 



Egg 



Larva 



Pupa 



Investigator 



Date 



Helochares 













1. lividus Forst. 





* 



Incomplete 



fCussac 

 \ Schiodte 



I 



France, 1852 

 Denmark, 

 1862 



2. maculicollis Muls. 



* 



* 



* 



Author 



United States, 

 this paper 



Cymbiodyta 













1. fimbriata Melsh. 



* 



* 



* 



Author 



United States, 

 this paper 



2. blanchardi Horn 







* 



Author 



United States, 

 this paper 



Helocombus 













1. bifidus Lee. 



Unde 



scribed. 









Philydrus 













1. testaceus Fabr. 



* 



* 





Schiodte 



Denmark, 

 1862 



2. per plexus Lee. 



* 



* 





Author 



United States, 

 this paper 



3. nebulosus Say 



* 



* 



* 



Author 



United States, 

 this paper 



4. ochraceus Melsh. 



* 



* 





Author 



United States, 

 this paper 



5. ductus Say 



* 



* 





Author 



United States, 











this paper 



6. hamiltoni Horn 



* 



* 



Author 



United States, 

 this paper 



Methods of Collecting 



The majority of these beetles live at the water's edge and, if the 

 soil, grass, or other vegetation is stirred rapidly or washed briskly with 

 the water, the Hydrophilids will soon be released and come to the surface. 

 They can then be easily gathered by the hand or, if small enough, by the 

 forefinger. They do not become submerged immediately as do the 



