232 
U. S. P. E. E. EXP. AND SUEVEYS-ZOOLOGY—GENEEAL EEPOET. 
total length. The eye and the mouth are fproportionally large. The insertion of the ventrals 
is situated somewhat in advance of the anterior margin of the dorsal fin. The scales are the 
largest among the hitherto known species of the genus. The color is uniform reddish above 
and on the sides ; yellowish beneath. A black spot exists at the base of caudal fin ; otherwise the 
fins'are unicolor. 
List of specimens. 
Catal. 
No. 
Cor. No. 
ofteeth. 
No. of 
spec. 
Locality. 
When 
collected. 
Whence obtained. 
Orig’l 
No. 
Nature of 
specimen. 
Collected by— 
143 
2721 
4 
Twenty miles west of Choctaw 
Agency. 
1853 
Lt. A. W. Whipple. 
XVI. 
Alcoholic. 
H. B. Mollhausen. 
3. HYBOKHYNCHUS PUNICEUS, Grd. 
Plate LII, Figs. 1—5; and, Figs. 11—15. 
Spec. Char. —Head constituting the fifth of the total length. Eye sub-circular; its diameter entering three times and a half 
in the length of the side of the head. Greatest depth of body less than the length of the head. Caudal fin entering six times 
in the total length. Insertion of ventrals situated somewhat posteriorly to the anterior margin of the dorsal. Scales rounded 
upon their anterior edge. Uniformly pale red, lighter beneath than above ; fins olivaceous. 
Syn. —Eyborhynchus punicem, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 179. 
By its general aspect this species is intermediate between R. perspicuus and H. tenellus, being 
however, distinguished from either of these by a more developed opercular apparatus and 
smaller scales. The latter are much deeper than long, sub-elliptical, their posterior edge 
forming a more closed curve than the anterior edge, which is equally rounded, radiating furrows 
being observed upon the posterior section only. The color is of a uniform pale red, lighter 
beneath than above ; the fins being likewise unicolor, of an olivaceous tint. 
References to the figures .—Plate LII, figs. 1 and 11, represent Ryborhynchus puniceus, size of 
life : fig. 1 from Llano Estacado ; and, fig. 11, from Antelope creek. Figs. 2 and 12 are sections 
of the body across the line of greatest depth. Figs 3 and 13 are scales from the dorsal region. 
Figs. 4 and 14, scales from the lateral line. Figs. 5 and 15, scales from the abdominal region. 
List of specimens. 
Catal. 
No. 
Cor. No. 
of teeth. 
No. of 
spec. 
Locality. 
When 
collected. 
Whence obtained. 
Orig’l 
No. 
Nature of 
specimen. 
Collected by— 
146 
2724 
i 
Llano Estacado._ 
1853 
Lt. A. W. Whipple 1 
.do. 
Alcoholic. 
H. B. Mollhausen. . 
145 
2723 
2 
Antelope creek, tributary 
of Canadian river. 
1853 
VIII. 
-do_ 
Dr. C. B. Kennerly. 
