31. CYPRINIDJi CERATICHTHYS. 
211 
324. A. oscula (Grd.) Cope. 
Difiers from A. henshavn in having a longer and more attenuated 
body, and narrow, sharp-pointed muzzle. Base of dorsal intermediate 
between base of caudal and end of snout; ventrals reaching anal, but 
not reached by iiectorals. Yellowish white above ; bright yellow below ; 
a broad blackish lateral baud; a narrow black stripe around muzzle ; 
males with the lower jaw and lower fins crimson in life. Head 4| (“ in 
total length”); depth 7^; eye 4i in head. D. 8; A. 7 ; scales 10-63-10. 
(jolorado to Arizona. [Cope.) 
{Argyreus osctiliis and notabilis Grd. Proc. Acad. Nat. Sci. PMla. 1856, 186, and in U. 
S. Mex. Bound. Surv. Ichth, 47 ; Cope, vol. v, Zool. U. S. Geog. Surv. W. 100th. Mer. 
647.) 
* * Lateral line with 80-90 scales. 
325. A. venfricosa Cope. 
Body rather elongate. Muzzle obtuse, but narrowed anteriorly, not 
overhanging the mouth. Eye 4 in head, shorter than snout. Caudal 
peduncle stout. Barbels small, sometimes obsolete. Scales very small. 
Dusky olive above; a blackish lateral band. Males with the axils of 
the pectorals and ventrals scarlet ; a scarlet spot above the gill-openings 
and one on the side of the muzzle. Head 4; depth 4^. D. 8; A. 7; 
scales 18-89-15 ; teeth 1, 4-4, 1. L. 2f inches. New Mexico to Arizona 
and Oregon; abundant. 
{Ceratichthys ventneosus Cope, Proc. Amer. Phil. Soo. Phila, 1876, 136; Cope, vol, 
V, Zool. U. S. Geog. Snrv. W. 100th Mer. 648 ; Jordan & Henshaw, Eept. Chief Eng. 
U. S. Geog. Surv. W. 100th Mer. 1878, 192.) 
92.— CERATICHTHYS Baird. 
Horny Heads. 
{Noeomis Grd ; fHybopsis Ag.) 
(Baird, 1853, brief notice; Girard, Proc. Acad. Nat. Sci. Phila. 1856, 2I2rtype Semoti- 
Itts blguttatus Kirtland.) 
Form various. Mouth terminal or inferior, with lips thin or some- 
what fleshy, a conspicuous barbel terminal on the maxillary, premax- 
illaries projectile. Teeth 4-4, or 1, 4-4, 1 or 0, hooked, without evident 
grinding surface. Scales rather large. Lateral line continuous. Dorsal 
fin inserted over, in front of, or slightly behind ventrals ; anal basis 
short. A large and varied group, horn; flsh ; from the 
nuptial tubercles of the typical species.) 
The species may be thus divided : 
* Species of large size, with the mouth anterior, the lower jaw included; the dorsal 
fm slightly behind the ventrals (Ceratichthys). 
biguttatus, micropogon, siimmetricus-. 
