GENERAL AND INTERIOR DISTRIBUTION 



Ixxxvii 



of the various other basins and areas may best be seen by comparing 

 them with this characteristic central basin as a type. 



The following is a list of the species of the Illinois system obtained 

 by us in collections, arranged in the order of the frequency of their 

 appearance in 1,115 collections made from that stream and its tribu- 

 tary waters. 



Species of the Illinois Basin, and Number of Collections 



containing each 



Species 



Golden shiner 



Bluegill 



Blunt-nosed minnow 



Green sunfish 



Black bullhead 



Redfin {lutrensis) 



Large-mouthed black bass 



Spot-tailed minnow 



Tadpole cat 



Black crappie 



Etheostonta jessicB 



White crappie 



Silverfin 



Orange-spotted sunfish . . . . 



Bullhead minnow 



Straw-colored minnow 



Channel-cat 



Common shiner 



Johnny darter 



Stone-roller 



Yellow bass 



River chub 



Collections* 



183 

 179 

 162 

 158 

 144 

 142 

 135 

 133 

 132 

 130 

 119 

 119 

 116 

 112 

 110 

 108 

 108 

 105 

 100 

 99 

 95 

 90 



Species 



Common red -horse 



Gizzard-shad 



Brook silverside 



Silvery minnow 



Warmouth 



Shiner 



Yellow bullhead 



Pumpkinseed 



Notropis heterodon 



Sucker-mouthed minnow 



Yellow perch 



Striped top-minnow 



Homed dace 



Black-sided darter 



Common sucker 



Small-mouthed black bass 



Blackfin 



Black-head minnow .... 

 Common top-minnow . . 



Hogsucker 



Grass pike 



Hadropterus phoxocephalus 



Collections* 



90 

 89 

 89 

 86 

 83 

 82 

 82 

 82 

 81 

 78 

 75 

 75 

 72 

 70 

 69 

 69 

 67 

 67 

 66 

 61 

 61 

 58 



*A cross (-1- ) in this column indicates the known occurrence of a species which 

 is not represented in our collections from the Illinois basin. 



