54 CLARENCE L. TURNER Vol. XXII, No. 2 



I. Hadropterus aspro Cope and Jordan. 



Eleven specimens of this fish were taken, ranging in length 

 from 34 to 66 mm. They were taken from the following local- 

 ities: Miami River near Sidney, Plum Creek east of Ft. Lar- 

 amie, Big Walnut Creek near Columbus, Black Lick Creek 

 near Reynoldsburg, Little Darby Creek near West Jefi"erson, 

 and from Deer Creek. 



May fly larvae, midge larvae, corixa nymphs, copepods, fish 

 remains and silt occurred in the stomachs and were so dis- 

 tributed as to leave the impression that there was no prevalent 

 food for a fish of any given length. For example, a 34 mm. 

 specimen had eaten only midge and may fly larvae, a 39 mm. 

 specimen had eaten 100 per cent of copepods and a 40 mm. 

 specimen had eaten corixa nymphs and small fish. A 66 mm. 

 fish had eaten 60 per cent of copepods, 38 per cent of may fly 

 larv£e and 2 per cent of silt. Corixa nymphs were eaten only by 

 those from Deer Creek and those containing a large per cent of 

 copepods in their stomachs all came from Big Walnut and 

 Black Lick Creeks. 



Summary of Food in Hadropterus aspro. 

 1. The food is quite variable, may fly larvae, midge larvae, 

 copepods and corixa nymphs being the most important food 

 animals. 2. There seems to be no change in the food habits of 

 specimens ranging from 34 mm. to 67 mm. 3. There is some 

 evidence that Hadropterus is a random feeder, taking within 

 certain limits whatever chances to be present. 



J. Hadropterus phoxocephalus Nelson. 



This rather rare species was taken only twice. A 53 mm. 

 specimen was taken from the Miami River near Sidney and a 

 57 mm. specimen from Black Lick Creek three miles north of 

 Reynoldsburg. As in H. aspro the principal food animals were 

 midge larvae, may fly larvae and copepods. 



K. Ammocrypta pellucida Baird. 



Three specimens of this fish were examined. A 36 mm. 

 specimen from Middle Bass Island near Put-in-Bay had eaten 

 90 per cent of midge larvae and a little silt. One 24 mm. spec- 

 imen from the west branch of the Mahoning River had taken 

 only midge larvae and one from Beaver Creek near Celina had 

 eaten a little sand and several midge larvae. 



