(87) 



APPENDIX. 



ON THE CRUSTACEA EATEN BY FISHES. 



I have recognized the following genera and species of Crustacea in the 

 stomachs of the fishes of the preceding list, several of them being new to the 

 state. The material afforded has been by no means exhaustively studied, 

 and the list of species could probably be quadrupled. I have refrained 

 from formal description of some species which are evidently new, preferring 

 to wait for specimens in more perfect condition. 



Cambanis immunis, Hagen. 



This is the only craw-fish I have yet noticed in the .stomachs of fishes, 

 and this I have seen but once (in the short-nosed gar;, unless young indi- 

 viduals eaten by a small cat-fish (^Amiurus melas) also belonged to this com- 

 monest of our species. 



AUorchestes dentata, (Smith) Faxon. 



Specimens of Lepiopomus paUidus, taken in Crystal Lake, McHenry 

 Co., in June, were feeding chiefly on this crustacean. It has also been 

 found in the same species, in L. ischyrus and in Morone interrupta from the 

 Illinois at Peoria. 



Crangonyx gracilis, Smith. 



The western form of this species (see Bull. No. 1, p. 6) occurs abund- 

 antly throughout central and southern Illinois. It is a very agile and vora- 

 cious creature, behaving in a jar of entomostraca like a tiger in a sheep-fold. 

 I have noticed that ponds in which it is at all common are nearly or quite 

 destitute of Euhrancliipus. The "handiness" with which it uses its anterior 

 feet in feeding is quite amusing. I have found it eaten only by the Top 

 Minnow ( Zygonectes notatus.) 



Asellus intermedius, Forbes. 



Eaten by Aphododerus from Union Co. A species of Asellus described 

 by Mr. 0. P. Hay, in the paper following this, as A. militaris, has recently 

 been collected in the Illinois River, and has been noted in the stomachs of 



