230 CONTRIBUTION'S TO NORTH AMERICAN ICHTHYOLOGY IV. 
of the back. Mouth sui.all, 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 tin inserted nearer the top of snout than 
to the base of caudal. Head 4^; depth 4J. D. 9; A. 0; Lat. 1. 98. Eio 
Gila. {Girard.) 
(Baird & Gir.ard, Proc. Acad. Nat. Sci. Phila. 1853, 388; Girard, U. S. Mex. Bound. 
Surv^ Iclitli. 62; Leuciscus emorii Giiutlier, vii, 242.) 
3G5. G. Macrea. Cope. 
Body rather slender ; profile and iuterorbital region gently convex. 
Maxillary not reaching line of orbit. Caudal peduncle slender, its least 
depth 4 ill 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 Elver (Eio Colorado). {Cope.) 
(Cope, Hayden’s Geol Surv. Wyom. 1870, 441, 1872. 
aa. Belly scaleless. 
366. O. seiiiinuda 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 of. D. 10; A. 10; scales 21-98-12; teeth 2, 5-4, 2. L. 0 
inches. Eio Virgen, in Utah. {Cope.) This species forms a transition 
to SquaUus and other normally formed Cyprinidee. 
(Cope & Yarrow, Zool. Wheelei’s Expl. W. 100th Mer. v, 666, 1876.) 
102.— SQUAIilUS Bonaparte. 
Dace. 
( Teksies Bonaparte ; Cheonda, Tigoma, Siboma, and Clinostom ii 8 Givard.) 
(Bonaparte, Fauna Italica, 1837, H 6 ; ty^ie Cyprinus leuciscus L., the European 
“Dace”.) 
Body oblong, compressed or robust, covered with moderate or small 
scales, which are not closely imbricated. Lateral line complete, de- 
curved. Mouth large or small, usually terminal, the lips normal, with- 
out barbel. Teeth mostly 2, 5-4, 2, sometimes 2, 5-5, 2, or 1, 5-4, 2, 
