232 



U. S p. E, E. EXP. AND SUEVEYS — ZOOLOGY — GENERAL EEPOET. 



total length. The eye and the mouth are jproportionally large. The insertion of the ventrals 

 is situated Fomewhat 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. 



3. HYBOKHYNCHUS PUNICEUS, Grd. 

 Plate LIT, Figs. 1—5; and, Figs. 11—15. 



Spec. Char. — Head constituting tUo fifth of the total length. Eye sub-circular; 'its diameter entering three times and a haft 

 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 auterior edge. Uniformly pale red, lighter beneath than above ; fius olivaceous. 



Sy.v. — Byborhynchw punkeua, Gkd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 179. 



By its general aspect this species is intermediate between H. perspicuus and H. tenellus, being 

 however, distinguished from either of these by a more develo{)ed 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 Hyhorhynchus 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 regioa. 



List of specimens. 



