Cope.] 476 (June 7, 
of Maryland and Delaware, and is but little valued for market. It is no 
doubt the species described first by Lesueur, as it is the only one of the 
genus seen in the Philadelphia market. I did not meet with it in North 
Carolina. - 
Ptychostomus duquesnei, Lesueur. 
A specimen of this fish from near Pittsburg, Lesueur’s original locality, 
suggests the correctness of the opinion of Rafinesque, that his Pt. eryth- 
rurus is a different species. The characters are seen in the 10 ventral 
radii, and the considerably more prominent muzzle, with correspondingly 
inferior mouth. The scales are also smaller 7—48—7 (to front of ven- 
tral). Dorsal fin little incised above, R. XIII. Length of head 4.6 in 
that of head and body ; orbit four times in head 1.75 times in interorbital 
space. Cranial crests moderate, the parietal region elevated as in Pt. 
macrolepidotus, not so plane as in Pt. erythrurus. Depth 3% in length. 
Lips moderately developed. Dentition as in Pt. erythrurus. The coloration 
in spirits is quite like that of other species, except that the dorsal region 
is a dark steel bluish, which the other species do not exhibit. Scales 
without black spot at base. 
Length of a moderate specimen from the Youghiogheny River, Penn- 
sylvania, one foot. 
Kirtland’s description in Proc. Boston Sci. Nat. Hist. V. 268, leaves it 
somewhat uncertain as to whether this species or the Pt. erythrurus was 
before him ; his figures resemble the present fish. I should not be sur- 
prised to find that his female ‘‘red-horse’’ described as so different from 
the male, was our Pt. collapsus. 
Ptychostomus carpio, C. V. 
This species differs from its near allies in the more numerous dorsal radii, 
etc. The form appears to be that of Pt. erythrurus. Its habitat is given 
by the French authors, as Lake Superior, and Ginther adds St. Lawrence 
River and Lake Erie. I have not seen it. The lip characters separate it 
from Pt. velatus. 
Ptychostomus oneida, Dekay. 
Geological survey New York, IIT, 189. 
This species is also similar in general proportions to the Pt. erythrurus, 
but has, according to Dekay, more numerous scales and a much smaller 
eye. Dekay says: seventeen longitudinal rows of scales counted at dorsal 
fin. Head and body 10 in.; tail 2.; head 2.5 (one-fourth); eye, .4 inch 
(one-sixth head). Radii D. XIII; V. 9. He does not describe the lips. 
Oneida Lake. 
Ptychostomus aureolus, Les. 
Agass. 1, c. 89. Catostomus aureolus. Lesueur J. A. N. Sci. Phila. I, 
95 Tab. 
With this species we enter a series characterized by the relatively small 
size the head bears to the body, and consequent apparent elevation of the 
latter. The head enters the length exclusive of the caudal fin, five times. 
