228 Bulletin 4"/, United States National Museum. 



Gila affinis, Abbott, Proc. Ac. Nat. Sci. Phila., 1860, 474; typo erroneously ascribed to Kansas 

 River. (Type, No. 21088, Coll. Abbott.) Jordan & Gilbert, Synopsis, 221), lss:i. 



Gila nacrea, Cope, Hayden's Geol. Siirv. Wyom. for 1870, 441, 1872; tributary of Green 

 River, Fort Bridger, Wyoming; young, perhaps, of G. eleijans; Jordan & Gilbert, .Syn- 

 opsis, 2;)0, 1883. 



LeuriaciiB robnstns, GCnther, Cat., vii, 241, 1868. 



Lenciscus grahami, Gv'nther, Cat., vii, 2J2, 1868. 



362. CJILA SEMINUDA, Cope & Yarrow. 



Head 5; depth 5|; eye 4. D. 10; A. 10; scales 21-98-12 ; teeth 2, 5-4,2. 

 Body moderately deep, witli slender aud tapering caudal peduncle, the 

 least depth of which is about one-third its length. Back little elevated, 

 not arched in front of dorsal. Head small, transversely convex, its pro- 

 file continuous with that of the back and not concave. Mouth rather 

 small, oblique, terminal, upper lip opposite the middle of orbit, the max- 

 illary not reaching liue of orbit. Eye large, rather anterior, but not 

 very low. Fins moderate. Dorsal slightly behind ventrals. Brownish 

 above, lower fins pink. Length 6 inches. Eio Virgen, in Utah, (Cope). 

 Not seen by us. This species forms a transition to Leuciscus and other 

 normally formed Cyprinidw. {seminudus, half naked. ) 



Gila semitinda, Cope & Yarrow, Zoiil. Wheeler's Expl. W. 100th Mer., v, 006, 1875, (1876), 

 Rio Virgen. (Type, No. 10975. Coll. Y"arrow.) Jordan & Gilbert, Synopsis, 230, 1883. 



ii6. LEUCISCUS, Cuvier. 



(Dace.) 



Leucisms, (Klein) Cuvier, Rogne Animal, Ed. i, 194, 1817, {dobnla, riaihiit, leurisciis, allmnnix, and 



pltoxiw(s). 

 PhoxiiiKx, Kafinesque, Ich.Oh.,45, 1820. (No type stated ; phoxiims understood.) 

 Dobtilu, Rafinesque, Ich. Oh., 45, 1820. (No type mentioned ; dobula understood.) 

 Leiu-igcns, Rafinesque, I. c. 45. (No type mentioned ; lenriscus understood.) 

 Plioxinns, Agassiz, Mem. Soc.Sci. Nat. Neufchatel, 1835, 37, {xilioxiuns). 

 Leuciscus, Agasbiz, Mem. Soc. Soi. Nat. Neufchatel, 18.35, 38, (leuciscui'), (not Leuciscus, IIeckel, 



and of Gi'NTHER, which is Rulilus of Rafinesqiie, the type being rutilus). 

 Sqitalins, Bonaparte, Fauna Italica, 1837, % 6, (lyberinns). 

 LeiicisciiK, Bonaparte, I.e., {arf;cntens= leuciscus). 

 Telestes, Bonaparte, I.e., {mtdicellus) . 



Cejj/io/w, Bonaparte, Catol. Metod.,1816, 39, {cephalus; no diagnosis). 

 Microlepis, Bonaparte, I. c, (tm-skyi; no diagnosis). 

 Richardsouius,* Girard, Proc. Ac. Nat. Sci. Phila., 18,")6, 201, {balteatus). 

 Tigoma, Girard, Proc. Ac. Nat. Sci. Phila., 1856, 205, (pidchella). 

 Chconda, Girard, I. c, 207, {cooperi). 

 Sibouia, Girard, I. c, 208, {crassicauda). 

 Clitwstomus, Girard, I. c, 211, {elougatus). 

 Ucmilremia, Cope, Proc. Amer. Philos. Soc, 1870, 462, {ntUxta). 

 Protoporiis, Cope, Hayden's Geol. Surv. Montana for 1871, 473, 1872, (domninus). 

 lotiehlkys, Jordan & Evermann, new subgenus (pldcgethdvlis). 



Body oblong, compressed or robust, covered with moderate or small scales. 

 Lateral line decurved, complete, or variously imperfect. Mouth usually 

 large and terminal, the lips normal, without barbel. Teeth mostly 2, 5-4, 2, 

 (in American species sometimes 1, 5-4, 2, or even by atrophy, 1,4-4,1), 



* The ventral carination, used in the Synopsis as the distinctive character of Uichardmnim, 

 has no real existence except in specimens shrunken by alcohol; the narrow belly is roundedin 

 cross section, fully eealed over, and without keel. 



