5 
70. Semotilus amblops, Raf.—Sruver CHus. 
(Bul. II, 62; Ceratichthys amblops: Synop. 214; do.) 
This fish has been obtained by us not rarely in Illinois, chiefly 
from the Ohio and the Wabash and the larger tributaries of the 
latter. 
| 
) 
‘71. Semotilus biguttatus, Kirt.—Horny Heap; River Cuus; JERKER. 
(Bul. II, 62; Ceratichthys biguttatus: Synop. 212; do.) 
_ This species seems limited, in Illinois, to creeks and rivers, and 
has not occurred in our collections south of the center of the State. 
'72. Semotilus corporalis, Mitch.—Cuuxs; Hornep Dace. 
Almost wholly confined to small streams, in which it 1s, in Ihli- 
nois, the most abundant minnow, commonest in_ those with muddy 
bottom; but a few have been obtained in the Illinois River, from 
lakes in the Illinois bottoms, and from the Little Wabash. It 
ranges throughout the State. 
Genus 42. Puaryeosrro, Gill. 
FiAT-HEADED CHUBS. 
73. Platygobio pallidus, Forbes. 
A single specimen of this very rare species, obtained in the Ohio 
‘River at Cairo, is the only one hitherto taken. 
Genus 43. Covssius, Jordan. 
74. Couesius prosthemius, Cope. 
Not in our collection. Specimens from near Evanston, taken in 
Lake Michigan, are said by Dr. Jordan to be in the National 
Museum. 
Genus 44. Rurnicutuys, Agassiz. 
15. Rhinichthys atronasus, Mitch.—Buacx-NoseD Dace. 
(Bul. II, 62 and 68; Rhinichthys cataracte, Rhinichthys obtusus, 
Rhinichthys meleagris: Synop. 207, 208; Rhinichthys cata- 
racte, Rhinichthys atronasus, Rhinichthys obtusus.) 
This is essentially a brook species, delighting especially in swift 
-and rocky streams. We have not found it in Southern Illinois, its 
localities being confined, in our experience, to the northern half of 
‘the State. Its relative rarity here is doubtless due to the infre- 
quent occurrence of suitable streams. . 
