230 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 



of tin- back. Mouth small, nearly terminal, the maxillary not reaching 

 to the front of the orbit. Eye rather large, anterior, not placed low. 

 Scales small, especially on the back and belly, the exposed surfaces 

 longer than deep. Fins large; the pectorals reaching ventrals ; the 

 caudal deeply forked. Dorsal I'm inserted nearer the top of snout than 

 to the base of caudal. Head 4; depth 4=V. D. 9; A. 0; Lat. 1. 08. Eio 



Gila. (fth-tml) 



( Hainl ,V cirard, Proc. Acad. Nat. Sci. Pkila. IH'iS, 388; (Jirard, U. S. Mex. Bound. 

 Surv. Irlitli. (>'2: J.i'iidxctts ciiiorii Giiuther, vii, 242.) 



:{<;>. <;. nan -:i < .>p.-. 



liody rather slender; profile and interorbital region gently convex. 

 Maxillary not reaching line of orbit. Candal peduncle slender, its least 

 depth 4 in head. Eye 5 in head. Pectorals not reaching ventrals. 

 Dorsal behind ventrals. Silvery white; back narrowly dark-shaded; 

 pectoral fins pink. Head 4; depth 4|. D. 9; A. 10; scales 21-?-13; 

 teeth 2, 5-4, 2. Green IJiver (Rio Colorado). (Cope.) 



(Cupr, Hayd.-n's <;..] Surv. Wynin. 1870, 441, 1872. 

 aa. Belly Mi-alrlrss. 

 366. G. semi II ml a Cope & Yarrow. 



Body moderately deep, with slender and tapering caudal peduncle, 

 the least depth of which is about one-third its length. Back little ele- 

 vated, not arched in front of dorsal. Head small, transversely convex, 

 its profile continuous with that of the back and not concave. Mouth 

 rather small, oblique, terminal, the upper lip opposite the middle of the 

 orbit, the maxillary not reaching the line of the orbit. Eye large, rather 

 anterior, but not very low, its length 4 in head. Fins moderate. Dor- 

 sal slightly behind ventrals. Brownish above, lower fins pink. Head 

 5; depth .Vf. D. 10; A. 10: scales 21-98-12; teeth 2, 5-4, 2. L. 

 inches. Kio V irg.cn, in Utah. (Cope.) This species forms a transition 

 to Sijualittx and other normally formed Ci/jtriniilu: 



((npr A Yarrow, /ool. Wlirdci's Kxpl. W. 100th MIT. v, 666, 1876.) 



102. S<H ALUIS Bouaparte. 

 l>nce. 



(7V7<*fi.s P.onaparli-; I'lu-innln, Tii/omti, Siboma, and ClinoHtomna (iirard.) 

 (Bonnpartr. J-'aiina Italica, 1837, [ ' : type CyprinHx lcncincitn L., the Eurojn'au 



Dace".) 



Body oblong, compress(!il or robust, covered with moderate or small 

 -(ales, which arc not closch imbricated. Lateral line complete, de- 

 curved. Mouth lai'gc or small, usually terminal, the lips normal, with- 

 out barbel. Teeth mostly 2, .~>-4, 2, sometimes 2, 5-5, 2, or 1, 5-4, 2, 



