xc 



FISHES OF ILLINOIS 



SOUTHERN (10) I 



Harelipped sucker 

 Pigmy sunfish 

 Round sunfish 

 Eupomotis heros 

 Hadropterus ouachitce 

 H. evides 



Crystallaria asprella 

 Etheostoma obeyense 

 E. squamiceps 

 Brindled stonecat 



.GREAT LAK.ES (5) ! 



Whitefish 

 Lake herring 

 Lake trout 

 Coitus ricei 

 Uranidea kumlienii 



MAIN MISSISSIPPI (1): 

 White sturgeon 



SUBTERRANEAN (1) ! 



Chologaster papilliferus 



RARE IN ILLINOIS (2): 



Brook lamprey 

 Long-no*sed dace 



As the Illinois basin contains 128 of the 150 species taken by us in 

 "the state, it is evident that the other and smaller basins must differ 

 from this negatively rather than positively. Being not only much 

 smaller, but also much less complex than the Illinois district, and 

 offering less variety of situations for fishes as homes and places of 

 resort, they may lack many species which find a fit environment 

 somewhere in the Illinois or its dependent waters, but can contain 

 relatively few not found there as well. 



Regarded from this standpoint, the Michigan district is farthest 

 removed from the Illinois ichthyologically, and of its fifty- seven spe- 

 cies nine (16 per cent.) are wanting in the Illinois basin. The Cairo 

 district differs much less, eight of its one hundred and one fishes 

 being without representation in our collections from the Illinois sys- 

 tem. Next follows the Wabash basin in Illinois, with ninety-five 

 species and a difference from the Illinois basin of 6 . 1 per cent. ; the 

 Galena district, with forty -four species and a difference of 4 . 6 per 

 cent. ; the Saline district, with fifty -five species, and a difference of 

 .3 . 8 per cent. ; and the Mississippi and its marginal area, with ninety- 

 seven species, 3 . 2 per cent, of which arc wanting to the Illinois 

 streams and lakes. The Kaskaskia and the Big Muddy, on the other 

 hand, which are scarcely more than extensions of the Illinois district 

 downward to the southern end of the state, contain virtually no fishes 

 hot in the main district, the Kaskaskia but one out of sixty-nine (1 .4 

 per cent.), and the Big Muddy none out of forty-two species. The 

 Rock River district differs from the Illinois by only three species out 

 of ninety-two (3 . 2 per cent.). These data are presented more com- 

 pactly in the table following. 



