31. CYPJUNIDJE CERATICHTHYS. 211 



824. A. oscula (Grd.) Cope. 



Differs from A. liensliavli 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 pectorals. Yellowish white above ; bright yellow below j 

 a broad blackish lateral baud ; a narrow black stripe around muzzle j 

 males with the lower jaw and lower fins crimson in life. Head 4 (" in 

 total length"); depth 7; eye 41 in head. D. 8; A. 7 ; scales 10-63-10. 

 Colorado to Arizona. (Cope.} 



(Argyreus osculus and notabilis Grd. Froc. Acad. Nat. Sci. Phila. 1856, 188, and in U. 

 S. Mex. Bound. Surv. Ichth. 47 ; Cope, vol. v, Zool. U. S. Geog. Surv. W. 100th Mer. 



(347.) 



** Lateral line with 80-90 scales. 



325. A. ventricosji 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 j a scarlet spot above the gill-openings 

 and one on the sifle of the muzzle. Head 4; depth 4f. D. 8; A. 7j 

 scales 18-89-15 ; teeth 1, 4-4, 1. L. 2f- inches. New Mexico to Arizona 

 and Oregon ; abundant. 



(Ceratiohthys ventricosus Cope, Proc. Auaer. Phil. Soc. Phila. 1876, 136; Cope, vol. 

 v, Zool. U. S. Geog. Surv. W. 100th Mer. 648 ; Jordan & Henshaw, Eept. Chief Eng. 

 U. S. Geog. Surv. W. 100th Mer. 1878, 192.) 



92. CERAT5CHTHVS Baird. 

 Horny Heads. 



(Nocomis Grd ; fHylopsis Ag.) 



(Baird, 1853, brief notice; Girard, Proc. Acad. Nat. Sci. Phila. 1856, 212: type Semotl~ 

 lus bigultatus 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, (x^a?, horn ; f0y<? } fish ; from the 

 nuptial tubercles of the typical species.) 



The species may be thus divided : 



* Species of large size, with the rnoutli anterior, the lower jaw included; the dorsal 

 fin slightly behind the ventrals (CERATICHTHYS). 



biguttatus, micropoyon, symmetricus* 



