and its Tributaries. 269 
sometimes iridescent with pale blue; sides coppery ; beneath 
the throat and abdomen white. The colors vary in specimens 
from different localities, and in different seasons of the year. 
Hab. The Ohio River and all its larger tributaries. 
FrwALE. The female differs from the other sex by having 
a larger head, mouth, and lips, Jarger trilobed scales, a quad- 
rangular dorsal fin, with the caudal fin less deeply bilobed 
and the lobes broader. The color of the fins.is also different ; 
the caudal, anal, and dorsal of the female being of a dusky 
olive or brown, and the pectoral and ventral a dull orange. 
Length from 1 to 2 feet. | 
Hab. Ohio River and its tributaries. 
Observations. The size, contour, and color of the male 
and female, as well as the forms of their fins, differ so much, 
that they are often mistaken for different species. Hence, 
I have deemed it expedient to give a drawing of each sex. 
It is also very difficult to distinguish the male of this species 
from the male C. anisurus. The absence of the deep sulca- 
tion before the eyes and of the elevated protuberance on the 
hose in the one, and their presence in the other, will always 
enable us to decide the point correctly. The color of the 
former is also darker and more cupreous. — 
The Red Horse Sucker remains permanently in our waters, 
and, during the winter, collects into numerous shoals in the 
deeper waters. It rarely, if ever; bites ata baited hook, but 
15 taken in great numbers by seines and nets. As an article 
of food, it is not highly valued. 
C. anisurus. Raf. White Sucker. White nose of the 
rman, i eee ua 
Catostomus anisurus. . Ohio Carp Sucker. Raf. Ichth. Obiensis, P- 5t: 
Plate XX. Fig. 9. 
uw elongate; nose prominent, with an elevated pro- 
ance ; between the protuberance and nostrils is a trans- 
