112 



The fourth and final list includes those species which are con- 

 fined to Southern Illinois, as above limited. 



Two species, Notropis macrolepidotus and Oxyf/eneuni pulverulentum, 

 have occurred in the central part of the State, but not in either 

 extremity, but as these are represented only by single specimens 

 each, this fact has no geographical significance. 



Another species Umbra limi, occurs in the two extremities of the 

 State, but not in the center, — a peculiarity explained by the prefer- 

 ence of the species for waters not ^occurring in Central Illinois. 



Northern. 



Lota maculosa, Perca americana, Etheostoma eos, Etheostoma 

 lineolatum, Etheostoma zonale, Hadropterus evides, Gasterosteus 

 inconstans, Esox nobilior, Fundulus diaphanus, Salvelinus namay- 

 cush, Coregonus artedi, Coregonus clupeiformis, Hyodon alsoides, 

 Squalius elongatus, Couesius prosthemius, Notropis anogenus, Hybog- 

 nathus nubilus, Ammocoetes niger, 



(Eighteen species.) 



Northern and Central. 



Lepomis gibbosus, Lepomis ischyrus, Labidesthes sicculus, Per- 

 copsis guttatus, Ehinichthys atronasus, Pimephales promelas, Catos- 

 tomus teres. 



{Seven species.) 



Southern and Central. 



Eoccus interruptus, Etheostoma asprigene, Hadropterus phox- 

 ocephalus, Lepomis notatus, Lepomis humilis, Lepomis symmetricus, 

 Notropis jejunus, Notropis lutrensis, Placopharynx carinatus, Ictio- 

 bus cyprinellus, Ictalurus marmoratus, Litholepis tristcechus, Scaph- 

 irbynchops platyrhynchus, Polyodon spathula. 



{Fourteen species.) 



Southern. 



Etheostoma fusiforme, Etheostoma flabellare, Diplesium blenui- 

 oides, Lepomis garmani, Centrarchus macropterus, Elassoma zoua- 

 tum, Gambusia patruelis, Chologaster papiliferus Platygobio palli- 

 dus, Ericymba buccata. 



{Ten species.) 



ECONOMIC EELATIONS. 



Our most valuable food fishes are found chiefiy in the perch and 

 salmon families : in the former the common perch, the sauger, (or * 

 "jack salmon"), the wall-eyed pike, the croppies, and the two black 

 bass ; and in the latter, the white-fish, the lake trout, and the lake 

 herring. 



