402 
Great Lakes on the one hand and the giant flood of the Mississippi 
on the other, and it is to be expected that its fish population will be 
highly typical of Illinois asa whole. It includes, in fact, more than 
four fifths of the species on our Illinois list, and the special features 
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 | Collections | Species Collections* 
Goldentshinerws econ | 183 | Common red-horse.......| 90 
Blneaall es yess) aces eee 179") \WWGizzard-shad a.) eosee eee 89 
Blunt-nosed minnow...... 162 Brookasilversid comemrreeeae 89 
Green Sumfish sn. cscee 158 | Silvery minnow.......... 86 
Black bullheads esac 144 Wanmouthistan ss seceer 83 
Redfin (lutrensts).......... 142 | Shiner. town Renn eenors 82 
Large-mouthed black bass 135 Wellows pulllneadeeeratn SZ 
Spot-tailed minnow....... 133 Punipkinseed ie. ... arene 82 
Madpolercataccm einen eee 132 Notropts heterodon........ 81 
Blaekicrappice.: vi... pene 130 Sucker-mouthed minnow 78 
Etheostoma jessi@......... 119 Vellow perchiisce sees se th) 
Wihite crappie. jas Greer 119 Striped top-minnow...... 75 
Dilvertinn ter cele cree 116 Elonnedydalce amen anit 72 
Orange-spotted sunfish... . 112 Black-sided darter....... 70 
Bullhead minnow......... 110 Common sucker... 69 
Straw-colored minnow..... 108 Small-mouthed black bass 69 
*A cross (+) in this column indicates the known occurrence of a species which 
is not represented in our collections from the Illinois basin. 
