CYPRIXID.* THE MINXOWS AND THE CARP 



101 



TABLE V 



Principal Cyprinid^e of Interior Lakes 



TABLE VI 

 Geographical Groups, Illinois Minnows 



PREFERRING THE OHIO 

 DRAINAGE 



Notropis illecebrosus 

 Ericymba buccata 

 Hybopsis amblops 



EVIDENTLY AVOIDING LOWER ILLINOISAN 

 GLACIATION 



Campostoma anomalum 

 Notropis blennius 

 X. cornutus 

 Ericymba buccata 

 Hybopsis kentuckiensis 



PREFERRING THE MISSISSIPPI 

 DRAINAGE 



Chi"' >s< imus erythrogaster 

 Hybognathus nubila 

 I'imephales promelas 

 Notropis gilberti 

 N. hudsonius 

 N. lutrensis 



FREELY ENTERING LOWER ILLINOISAN 

 GLACIATION 



Hybognathus nuchalis 

 Pimephales notatus 

 Abramis crysoleucas 

 Cliola vigilax 

 Notropis whipplii 

 N. atherinoides 

 X. rubrifrons 

 Hybopsis amblops 



The first table, relating to the twenty-four most abundant 

 species, shows the relative frequencies of occurrence of each species 

 in our collections from each class of situations indicated bv the 

 headings of the columns. The figures of these columns, called 

 coefficients of frequency, when larger than 1 indicate a greater than 

 average frequency in the situation named, and, when smaller than 

 1, a lesser frequency. That is to say, if all the species of minnows 

 had been equally and uniformly distributed through all classes of 

 situations, the coefficients of this table would all have been 1. 

 Referring, for example, to Campostoma anomalum, in the first hue 

 i >f the table, it will be seen that 1 95 i if i >ur c< dlectii <ns o mtained this 

 species. The number of collections from larger rivers containing 

 tins minnow, as shown by the figures in the second column of the 

 table, were. 21 of the number which would have contained it if it 





