The Productk'lty of Fish Food in Oneida Lake 195 



Family ^sciinid/E 

 Gomphus spicatus 1 laf^cn. Nymph. 



Family Liui'.LLi'Din.T: 



Didymops transversa (Say). Tetragoneuria cynosura Say. 



Nymph. Nympli. 



With two exceptions (belonging to the Family Libellulidae) 

 all of the Odonata nymphs are inhabitants of comi)aratively 

 shallow water, 1)^-4 feet. In the last family, however, the 

 nymphs were found only in deep water, 8 and 11 feet. 

 Gomphus was found on all varieties of bottom except boulder 

 and gravel, and the Libellulidae on a mud bottom. The tables 

 in the chapter on the Composition of the Bottom Fauna show 

 that the Odonate nymphs are not abundant at this time of the 

 year and it was also noted that adult dragon-flies were equally 

 scarce. Earlier in the year they are probably much more 

 abundant. Many dragon-fly nymphs furnish food for fish, 

 and the grou]) is an important one from the standpoint of 

 fish culture. Identifications by Dr. J. (j. Needham. 



order nf.uroptera 

 Family Sialid.e 

 Sialis infumata New'man. 



The larva of this insect occurred rarely in water 2^/1^-8^ 

 feet deep, on a clay and mud bottom. Its value as fish food 

 is not well known. Identified by Dr. J. (I. Needham. 



ORDKR IIEMIPTERA 



The aquatic Hemiptera collected were mostly in the nymph 

 stage. The species represented were largely confined to mud 

 and clay bottoms and to shallow water. The exception was 

 a species of Notonecfa (in the nymph stage) which occurred 

 in 14 and 15 feet of water on a mud bottom. These water 

 bugs are eaten by many fish. Identifications by Mr. Wm. J. 

 Gerhard. 



