172 CONTRIBUTION'S TO NORTH AMERICAN ICHTHYOLOGY IV. 



§§ Scales deeper than long, very closely imbricated along sides of the body. 

 * Teeth 4-4. 



t Edges of teeth entire. (Codoma.*) 



t Teeth with grinding surface developed. 



223. C. iris (Cope) J. & G. 



Body deep, compressed, as in Gyprinella. Dorsal outline well arched. 

 Month moderate, oblique, the jaws subequal. Eye moderate, 4 in head. 

 Scales very narrowly exposed on the sides, the lateral line decurved. 

 Seventeen rows of scales in front of dorsal fin, which is inserted behind 

 ventrals; pectoral fin reaching ventrals; ventrals reaching anal; dorsal 

 and caudal short. Males in spring with the snout in front tuberculate. 

 Color bright, clear green above ; a green band extending down behind 

 operculum ; head and belly vermilion-red ; a large, square vermilion spot 

 behind the green scapular stripe. Lower fins crimson ; caudal vermil- 

 ion; dorsal olivaceous, unmarked. Females plain olivaceous and sil- 

 very. Head Sf ; depth 3^. D. 8 ; A. 9 ; scales 5-33-3 ; teeth 4-4. L. 

 2 J inches. Upper Eio Grande. The most brilliantly colored fish in 

 New Mexico. (Cope.) 



(Rypailepis iris Cope, Wheeler's Espl. W. 100th Mer. v, 653, 1876.) 



224. C. jaig-aBis (Cope) J. &. G. 



Form stout, compressed. Back much elevated, descending steeply to 

 tlie end of the muzzle. Upper jaw rather the longer, maxillary reach- 

 ing beyond the front of the orbit. Eye moderate, 4| in head. Pectorals 

 nearly reaching ventrals. Sides and lower fins milky white 5 a dusky 

 shade on dorsal fin ; a broad dark vertical bar behind head ; a dusky 

 shade on the side between ventrals and anal. The coloration, therefore, 

 essentiaPy that of the species of the group Photogenis. Head 4 ; depth 

 3. D. 8 ; A. 9 ; scales 7-34-4 ; teeth 4-4 (said to be 1, 4-4, 1 in young 

 specimens), with rather narrow grinding surface. L. 2^ inches. Mis- 

 souri River and Arkansas Eiver. (Cope.) 



{Moniana jugalis Cope, Hayden's Geol. Surv. Wyom. for 1870, 1872, 439.) 



It Teeth without grinding surface. 



a. Dorsal liu inserted notably behind ventrals; head very short and blunt, al- 

 most round. 



225. C. vallata (Grd.) J. & G. 



Body rather stout, heavy anteriorly, with long caudal peduncle ; the 

 back not arched. Head blunt and heavy, but less gibbous than in C. 

 ornata. Mouth moderate, quite oblique, the maxiilary not reaching to 

 the eye. Eye rather small, nearly 5 in head. Scales rather small. 



* Girard, Proc. Acad. Nat. Sci. Phila. 1856, 194 : type Codoma vittata Grd. (A coined 

 name.) 



