Jordan and Evermann. — Fishes of North America. 227 



of the lower jaw hard. Eyo small, anterior, i)laced low. Isthmus nar- 

 row. Gill rakers rather weak. Fins all long and falcate, larger than in 

 G. robusta. Pectorals reaching ventrals; caudal tin deeply forked, its 

 lobes long and pointed, the upper somewhat the longer; the rudimental 

 basal rays strong, about 12 in number on each side. Scales scarcely 

 imbricated at all, those on the caudal peduncle hardly touchin"- each 

 other, on the sides of the body much longer than deep; their texture 

 thin and membranaceous; scales on back and belly much smaller than 

 on sides and smaller than in other species, those on middle line of back 

 obsolete or nearly so. Coloration bluish above, pale below. Length 12 

 inches. Colorado and Gila rivers, abundant in the channels, but not 

 ascending so far as G. robusta. (elegans, elegant.) 



Gila elegans, Baibd & GiuAKi), Proc. Ac. Nat. Sci. Phila., 1853, 369, Zuni, Colorado, and Gila 

 rivers. (Type, Nos. 935 and 20^G5. Coll. Maj. 'Thomas.) Giuard, Pac. R. R. Surv., x, 

 286, 1858 ; .Jordan & Giltsert, Syuopsis, 227, 1883 ; Jordan, Bull. U. S. Fish Coiiim., ix' 

 1880, 27; Kirsch, Proc. U. S. Nat. Miis.,'188S, .558. ' " 



Gila emoriji, Baird & Girard, Proc. Ac. Nat. Sci. Pbil., 1853, 388, Gila River. (Type, No. 247. 

 Coll. John \j(i Conte.) Jordan & Giluert, synopsis, 229, 1883. 



Letwuicns eleijuus, GiNXiiER, Cat., vii, 211, 1868. 



Leucisciis eiiwrii, Gunther, Cat., vii, 242, 1SC8. 



361. OILA ROBUSTA, Baird A (iirard. 



(ROI'ND-TAII,.) 



Head 4; depth 5 ; eye 5 to 8. D. 9 ; A. 9 ; scales 17-80-10 ; teeth 2, 5-4, 

 2. Body elongate, the back elevated and the head depressed as in Gila 

 elegans, but the caudal peduncle notably stouter, its least depth about 

 one-third its length, 3i in length of head and 1^ in maxillary; young 

 with the head less depressed and the profile scarcely concave. Mouth 

 large, the upper lip on the level of lower part of orbit. Fins rather 

 lower than in G. elegans, the pectorals in the male reaching'ventrals, but 

 falling short in the female. Eye small, low, anterior. Lateral line much 

 decurved. Coloration plain ; males in life with lower fins and lower side 

 ot head red, and a vertical red dash on cheeks. Length 16 inches. Trib- 

 utaries of the Rio Colorado and Rio Gila, very common up to the foot 

 of the mountains in Colorado (Uncompahgre'River at Delta); the fiesh 

 full of small bones and nearly worthless as food, (rohustus, stout.) 



Gilarohusla, Baird & Girard, Proc. Ac. Nat. Sci. Pliila., 1853, 308, Zuni River. (Tj'jie, Nos. 

 276 and 277. Coll. Woodhouse.) Girard, Pac. B. K. Surv., x, 285, 1858; Jordan & Gil- 

 uert, Synopsis, 228, 1883; Jordan, 'Bull. U. S. Fish Coniiii., ix, 1889, 27. 



GilaijraciUs, Baird & Girard, Proc. Ac. Nat. Sci. Phila., 1853, 369, Zuni River. (Typo, No. 

 245. Coll. Capt. Sitgreaves.) Girard, Pac. E. R. Surv., x, 287, 1858; Jordan & Gilreut, 

 Synopsis, 229, 1883. 



Gila yrahawi, Baird & Girard, Proc. Ac. Nat. Sci. Phila., 1853, 389, Rio San Pedro, tributary 

 to Rio Gila. {Typv, No. 2.52. Coll. Clark.) Girard, U. S. & Mex. Bound. Surv., Ichth., 

 61, 18.".9; Jordan & Giluert, Synopsis, 228, 1883. 



Plychocheihis vora.r, Girard, Proc. Ac. Nat. Sci. Phila., 1856, 209, and Pac. E. E. Surv., x, 301, 

 1858, locality unknown The type of " vonur," examined by us is a true Gila. (Coll. 

 Kreuzfcld.) 



Leuci.-'ciis cwHHeHsiV, Gintuer, Cat., vii, 241, 1868, Zuni River; substitute for </iacilis, preoccu- 

 piod ill I.enciscus. 



