Rea lea 
L. Agassiz on the Ichthyological Fauna of Western America. 87 
rinus oblongus, introduced by Dr. Mitchell in his Report of the 
fishes of New York, the specific appellation of oblongus must of 
course be preserved for it. Since DeKay has represented four 
forms of this species, I may avail myself of his figures to give 
an idea of its variations: Catostomus tuberculatus, P|. 31, fig. 97 
represents the male in the spawning season, with tubercles upon 
the snout, a long dorsal and a lobed anal. DeKay mentions its 
appearance in April. Labeo oblongus, P|. 42, fig. 136, isan adult 
male in winter, with a long dorsal and a lobed anal, but without 
tubercles. DeKay observed its appearance in December. Labro 
gibbosus, Pl, 32, fig. 101, is a younger male, with less deeply 
obed anal; Labeo elegans, Pl. 31, fig. 100, is a young female in 
Winter dress, with a shorter dorsal, trapezoidal anal and a more 
slender form. Dekay observed his specimens in October and 
November; Labeo Esopus is an adult female with a somewhat 
emarginate anal, broader than the preceding ; Catostomus vittains, 
Lesueur, with “a black stripe passing from the snout through the 
eye to the candal fin, dividing the body equally” in the young. 
T have traced all these differences in specimens taken from the 
same pond in different seasons of the year. Lesueur, who first 
described Catostomus gibbosus and tuberculatus, already remarked 
that these species may be founded upon the two sexes of one and 
the same species. Instead of availing himself of this hint and 
ascertaining its correctness, DeKay has ouly increased the confu- 
sion by describing three other forms as so many additional spe- 
cies, and he has unfortunately been followed by later compilers. 
This Species ranges through the States of Massachusetts, Con- 
necticut, New York, New Jersey, Pennsylvania, and Maryland, 
I have obtained specimens from the Susquehanuah through the 
kindness of Prof. 8. S. Haldeman, from Carlisle, Pa., through 
Prof. Baird, from Chestertown and Havre de Grace, Maryland, 
through F. R. Williams, Esq. and Dr. Wroth. I entertain seri- 
ous doubts as to the identity of the form found in Lake Cham- 
plain. The other species of the genus are Catostomus Sucetta, 
Les. (Cyprinus Sucetta, Lacep. ), from Charleston, and other locali- 
ties in South Carolina. This species occurs also in Georgia. I 
ave received specimens from that State from Athens, through the 
kindness of Prof. J. Le Conte, and from the Altamaha, through 
G, Belknap, Esq. , 
The third species is the Catostomus (Moxostoma) anisurus, 
Raf, from the Ohio, which I have found as far west as the vicin- 
ity of St. Louis (Missouri), and of which specimens have been 
kindly forwarded to me from the Scioto River, by J. Sullivant, 
