GENERAL AND INTERIOR DISTRIBUTION 



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 , 1 1 5 collections made from that stream and its tribu- 

 tary waters. 



Species of the Illinois Basin, and Number of Collections 

 containing each 



Species 



Collections* 



Species 



Collections* 



Golden shiner 



Bluegill 



Blunt-nosed minnow 



Green sunfish 



Black bullhead 



Redfin (lulrcusis) 



Large-mouthed black bass 



Spot-tailed minnow 



Tadpole cat 



Black crappie 



Etheosloma jessice 



White crappie 



Silverfin 



Orange-spotted sunfish. . . 



Bullhead minnow 



Straw-colored minnow. . . . 



Channel-cat 



i i i union shiner 



Johnny darter 



Stone-roller 



Yellow bass 



River chub 



183 

 179 

 162 

 158 

 144 

 142 

 135 

 133 

 132 

 130 

 119 



119 



116 



112 

 1 10 

 108 

 108 



105 



100 



99 



95 



90 



Common red-horse 



Gizzard-shad 



Brook silverside 



Silvery minnow 



Warmouth 



Shiner 



Yellow bullhead 



Pumpkinseed 



Notropis heterodon 



Sucker-mouthed minnow 



Yellow perch 



Striped top-minnow 



Horned dace 



Black-sided darter 



Common sucker 



Small-mouthed black bass 



Blackfin 



Black-head minnow .... 

 Common top-minnow .. 



Hogsucker 



Grass pike 



Hadropterus phoxocepkalus 



90 

 89 

 89 

 86 

 83 

 82 

 82 

 82 

 81 

 78 

 75 

 75 

 72 

 70 

 69 

 69 

 67 

 67 

 66 

 61 

 (.1 

 58 



\ .toss ( f ) in this column indii ates the known i rrerice of a species which 



is not represented in our collections from the Illinois basin 



