31. CYPRINID^ CERATICHTHYS. 211 



321. A. osciila (Grd.) Cope. 



Difiers from A. hensliavli in havinjj 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 ; 

 a broad blackish lateral band; a narrow black stripe around muzzle; 

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

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

 Colorado to Arizona. {Cope.) 



(Argyreus osculus aud notahilis Grd. Proc. Acad. Nat. Sci. Pliila. 185G, 18G, aud iu U. 

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

 G47.) 



* * Lateral line with 80-90 scales. 



3JS5. A. vcntricosa 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. Ilead 4; depth 4|^, D. 8; A. 7; 



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



and Oregon; abundant. 



(Ceratichthys ventricoms Cope, Proc. Amer. Phil. Soc. Phila. 1876, 136; Cope, vol, 

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

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



92.— CERATICHTHVS Baird. 

 Horny Heads. 



(Nocomia Grd ; ? Ilyiopsis Ag. ) 



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

 Ills higidtatus 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. Lateralline continuous. Dorsal 

 fin inserted over, in front of, or slightly behind ventrals; anal basis 

 short. A large and varied group. {xipa<;, horn ; r;/tfo?, fish ; from the 

 nuptial tubercles of the ty])ical species.) 



The species may be thus divided : 



• Species of large size, with the mouth anterior, the lower jaw included; the dorsal 



tin slightly behind the ventrals (Ceraticuthys). 



bigVitfatus, mlcropogon, symmetricna. 



