172 CONTKIBUTIOXS TO NORTII AMERICAN ICHTHYOLOGY IV. 
§§ Scales deeper than long, very closely imbricated along sides of the body. 
* Teetb 4-4. 
t Edges of teeth entire. ( Codoma. * ) 
t Teeth with grinding surface developed. 
3^3. C. iB’is (Cope) J. & G. 
Body deep, compressed, as in Cyprinella. Dorsal outline well arched. 
Mouth moderate, oblique, the jaws subeqnal. Eye moderate, 4 in head. 
Scales very narrowly exposed on the sides, the lateral line deenrved. 
Seventeen rows of scales in front of dorsal fin, which is inserted behind 
veutrals; pectoral fin reaching veutralsj veutrals reaching anal; dorsal 
and caudal short. Males in spring with the snout in front tnberculate. 
Color bright, clear green above; a green baud extending down behind 
opercnlnm ; 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 3|; depth 3:|. D. 8; A. 9; scales 5-33-3; teeth 4-4. L. 
inches. Upper Eio Grande. The most brilliantly colored fish in 
New Mexico. {Cope.) 
{Ht/psilepis iris Cope, Wheeler’s Expl. W. lOOlh Mer. v, 653, 1876.) 
224. C. jajg'jaOis (Cope) J. & G. 
Form stout, compressed. Back much elevated, descending steeply to 
the 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 veutrals. Sides and lower fins milky white ; a dusky 
shade on dorsal fin ; a broad dark vertical bar behind head ; a dusky 
shade on the side between veutrals and anal. The coloration, therefore, 
essentiaby 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. inches. Mis- 
souri Eiver and Arkansas Eiver. {Cope.) 
{IToniana jugalis Cope, Hayden’s Geol. Snrv. Wyom. for 1870, 1872, 439.) 
B Teeth without grinding surface. 
a. Dorsal fin inserted notably behind veutrals; head very short and blunt, al- 
most round. 
225. C. viStJitsi (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 maxillary 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 vittafa Grd. (A coined 
name.) 
