88 
The fourth and final list includes those species which are con- 
fined to Southern Illinois, as above limited. 
Two species, Notropis macrolepidotus and Oxrygeneum 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, Htheostoma eos, Etheostoma 
~ lineolatum, Etheostoma zonale, Hadropterus evides, Gasterosteus 
inconstans, EHsox nobilior, Fundulus diaphanus, Salvelinus namay- 
cush, Coregonus artedi, Coregonus clupeiformis, Hyodon alsoides, . 
Squalius elongatus, Couesius prosthemius, Netiope anogenus, Hybog- 
nathus nubilus, Ammoceetes niger. 
(Highteen species.) 
NORTHERN AND CENTRAL. 
Lepomis gibbosus, Lepomis ischyrus, Labidesthes sicculus, Per- 
copsis guttatus, Rhinichthys atronasus, Pimephales promelas, Catos- 
tomus teres. | 
(Seven species.) 
SOUTHERN AND CENTRAL. 
Roceus interruptus, Etheostoma asprigene. Hadropterus phox- 
ocephalus, Lepomis notatus, Lepomis humilis, Lepomis symmetricus, 
Notropis jejunts, Notropis lutrensis, Placopharynx carinatus, Ictio- 
bus cyprinellus, Ictalurus marmoratus, Litholepis tristcechus, ‘Scaph- 
irhynchops platyrhynchus, Polyodon spathula. 
(Fourteen species.) 
SOUTHERN. 
Etheostoma fusiforme, Htheostoma flabellare, Diplesium blenni-' 
oides, Lepomis garmani, Centrarchus macropterus, Elassoma zona- 
tum, Gambusia patruelis, Chologaster ‘papiliferus, Platygobio palli- 
dus, Ericymba buccata. 
(Ten species.) 
. ECONOMIC RELATIONS. 
Our most valuable food fishes are found chiefly in the perch and 
salmon familes: 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. | 
But little inferior to the perches are the two principal members 
of the pike family—the common pike and the muskallunge. Infe- 
rior but always salable species are found among the cat-fishes, ie 
poy ty 
