79 
ffects, however, gravelly spots in muddy streams. It 1s not com- 
non in rivers, but is occasionally taken at the mouths of creeks. 
+ has not been found by us in ponds, but specimens were collected 
rom the small lakes of Northern Illinois. 
18. Pimephales promelas, Raf.—Fa1-1e\n; Buack-HEaDED Minnow. 
~The distribution of this fish in ths Stace is somewhat peculiar. 
The species is altogether absent, as far as our collections indicate, 
rom the prairie streams of Central Illinois. It is not uncommon 
n small muddy creeks connected with the larger rivers, and occurs 
recasionally in these latter streams themselves. We have not taken 
t in lakes or ponds or similar waters, neither has it occurred to us 
n Illinois south of the latitade of Alton. 
Genus 50. Hysoanatuus, Agassiz. 
94. Hybognathus nubilus, Forbes. 
(Bul. II, €6; Alburnops nubilus: Synop., 167; Cliola nubila.) 
This minnow has thus far been reported only from Illinois, and 
las occurred in our collections only from the extreme northern part 
f the State—from the Rock River and its tributaries. 
95. Hybognathus nuchalis, Agassiz.—Sitvery Minnow. 
Almost strictly a river species, being most abundantly represented 
n our collections from the Illinois, and next from the Wabash, 
Yhio and Mississippi. We have not taken it in any lake or pond 
yutside the great river bottoms, and it has occurred but rarely in 
sreeks. 
Genus 51. Curosomus, Raf. 
6. Chrosomus erythrogaster, Agassiz.—RED-BELLiED Dacs. 
This species has occurred sparingly in our collections, but from 
all parts of the State, both in rivers and small streams. We have 
aot taken it, however, from lakes or ponds. 
Genus 52. Oxycrneum, Forbes. 
7. Oxygeneum pulverulentum, Forbes. 
Only a single specimen of this genus and_ species is thus far 
known, and this was taken from the Illinois River, at Peoria. 
Genus 53. Campostroma, Agassiz. 
98. Campostoma anomalum, Raf.—SToNe-ROLLER ; STONE-LUGGER. 
This species is very common in small streams throughout the 
State, from Galena to Cairo, and occurs occasionally in rivers, but 
rarely or never in lakes and ponds. 
