The Productivity of Fish Food in Oneida Lake 199 



The identification of chironomid larvse is attended with 

 difficulty owing- to the present lack of knowledge concerning 

 these early stages of the midges. It has been possible to iden- 

 tify these forms only as far as the genera, for this reason. 

 Rearing the larvae contained in this body of water would add 

 greatly to our knowledge of this subject. The larvse of these 

 midges, especially of Chirononms, were very abundant in fila- 

 mentous algae, associated with caddis-fly larvae, oligochaete 

 worms, small crustaceans, and gastropod mollusks. They 

 occurred on all varieties of bottom, being most abundant on 

 sand and least abundant on gravel bottoms. In depth, Chiro- 

 nonms and Palpomyia descend to 15 feet and the Tanypinae 

 to 18 feet. The majority of larvae, however, were found at 

 depths ranging from one to four feet. Identifications mostly 

 by Dr. O. A. Johannsen. 



order coleoptera 

 Family Dytiscio-'e 

 Bidessus flavicollis Lcc. Bidessus afBnis Say. 



Family Haliplid/e 

 Haliplus ruficollis DcG. Haliplus species. 



Family Gyrinid.e 



Gyrinus affinis Aube. Gyrinus ventralis Kirby. 



Gyrinus species (larva). Dineutes assimilis Aube. 



Family FIydrophilid.e 



Helophorus nitidulus Lee. Philhydrus ochraceus Mels. 



Helophorus lineatus Say. Creniphilus subcupreus Say. 



Helophorus inquinatus Berosus peregrinus Hbst. 



Mann. Berosus species. 



Family Parnid.e 



Psephenus lecontei Lee. Dryope species (larva), 

 (larva). Elmis bivittatus Lee. 



