XCV111 



PISHES OF ILLINOIS 



An examination of the general distribution of the species of these 

 sectional lists of Illinois fishes shows, as was to have been expected, 

 that the distinctively northern Illinois fishes are chiefly northern in 

 their outside range, and that those of southern Illinois are mainly 

 southern. Thus, of the 14 especially northern Illinois fishes, 11 are 

 northerly in their general distribution and 1 is southerly ; while of the 

 9 distinctively southern Illinois species, 6 are southerly in their gen- 

 eral range, 1 is western, and 1 is a cave-fish local to Illinois. The 

 species found in the northern and central sections of the state and 

 not in the southern are varied in their distribution, 6 of them ranging 

 northward from Illinois, and 4 of them in all directions, while 1 has 

 been thus far found in Illinois only. The central and southern fishes, 

 on the other hand, comprise 7 southern species, 1 of northern and 8 

 -of general range, and 1 whose distribution is not recorded. Includ- 

 ing only species whose general area shows that their restricted occur- 

 rence in Illinois is a feature of their geographical distribution at 

 large, and excluding fishes special to theGreat Lakes.we have twenty- 

 six species whose distribution in this state seems limited by condi- 

 tions connected with differences in latitude merely — twelve of these 

 species essentially northern and fourteen of them southern. 



Especially Northern Species in 

 Illinois (16): 



Whitefish 



Lake herring 



Lake trout 



Long-nosed sucker 



Lake carp 



Notropis anogenus 



Great Lake catfish 



Mooneye 



Pike 



Muskallunge 



Menona top-minnow 



Brook stickleback 



Nine-spined stickleback 



Trout-perch 



Coitus ricei 



Uranidea kumlicnii 



Especially Southern Species in 

 Illinois (14): 



Alligator-gar 

 Blue cat 



Ictalurus anguilla 

 Freckled stonecat 

 Harelipped sucker 

 Notropis ,pilsbryi 

 Viviparous top-minnow 

 Pigmy Sunfish 

 Round sunfish 

 Lepomis symmetricus 

 Eupomdtis heros 

 Hadropferus ouachitm 

 Etheostoma obeyense 

 E. squatpiiceps 



USE OF LOCALITY MAPS 



In the foregoing discussion of the sectional distribution 'of Illinois 

 fishes no account has been taken of differences in the frequency of the 

 occurrence of the species in the different sect-ions in which they have 

 been found, a single occurrence in southern Illinois, for example, 

 counting for as much as fifty such occurrences in the northern part of 

 the state. That highly interesting and important peculiarities of 



