1870.) ATT 
(Cope, 
This species resembles the Pt. macrolepidotus Les., more than it does 
the Pt. erythrurus, but the proportionate size of the head is less. In a 
specimen 8 inches long, the scales are 6—49—4; radii D. XII, V. IX. 
The supraoccipital region is much elevated and convex, the interorbital 
region convex, but without keel. The muzzle is prominent, and separated 
on the upper surface by a deep transverse depression. The mouth is but 
little overpassed by the muzzle, and is large. The lips are rather narrow. 
Eyes five times in length, 2.5 times in interorbital breadth of head. 
I do not recollect the colors of this sucker in life; Lesueur states the 
fish to be orange above, bases of scales darker ; inferior fins red. 
A single specimen from Saginaw Bay, Lake Huron, has furnished me 
with means of comparison. It agrees exactly with Lesueur’s account 
of it. The basis of the scales of some dorsal series are blackish. The 
species is supposed to be confined to the Great Lakes. 
Ptychostomus sueurii. Rich. 
Catostomus sueurti, Richardson Fr. Journ. 1828, 772. Fauna Boreali 
Americana III, 118. 
This species appears to me to be very near the last, and agrees with it 
in proportions of head to body, of depth, fin radii, squamation, etc. He 
says, however, that the muzzle projects an inch beyond the mouth, ina 
specimen nineteen inches long, which is certainly not the case in the 
species last described. Hence I suspect it to be distinct, and that it will 
be found to possess other characters when re-examined. Gunther, (Ca- 
tal. Brit. Mus.) refers it to the C. macrolepitotus, to which it is evi- 
dently nearly allied. 
From the Fur countries, British North America. 
72. PTYCHOSTOMUS CRASSILABRIS, Cope. 
Species nova. 
This sucker is near the Pt. aureolus, but has a more contracted conic 
muzzle, and smaller mouth; it is also a flatter and more clupeiform fish. 
Supra-occipital region elevated, convex; orbit 4.2 in length of head, 2 
times in interorbital width. Depth 3.75 times in length. Scales large, 
5—44—5. D. XII; V. 9. Length of specimen described, one foot. 
Color in life silver, above with a smoky shading, and the scales black at 
the bases. Dorsal fin blackish, inferior fins white. Top of head blackish ; 
a black band from occiput to pectoral fin. 
The lips of this species are thick, the lower truncate, but the mouth is 
very small. In these features it is between P. conus and P. aureolus. 
The dorsal fin in the specimen described is elevated in front, the basis 
being only .75 the first soft ray, in length. The margin is deeply con- 
cave. The fewer dorsal radii, as well as the less prominent muzzle, dis- 
tinguish it from Pt. conus. 
From the Neuse River, near Raleigh, N. Ca. 
A. P. 8.—VOL. XI.—325 
