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<br />PLECTOSPONDYLI-OYPRINIDAE-GILA ROBUSTA-. 663
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<br />GILA NIGRA, Cope, sp. novo
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<br />PLA.'fE XXX, FIGS. 3, 3a.
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<br />This species, which is represented by a number of specimens III the
<br />collection of the survey, resembles those last enumerated, and differs from
<br />the 'G. pandora in the considerably more numerouS scales j from t~e G. egre-
<br />gia it. differs in the relatively larger head, which enters the length minus
<br />the caudal fin only three and one-half times, instead of four times. The
<br />2t 20 20
<br />dental series is found to be in several specimens 4.2-2.5. Scales,~,~,~, in
<br />12 11 1l
<br />three specimens. General shape f~lsiform j profile gradually' descending,
<br />then decurved to the upper lip, which overhangs the lower by a little j
<br />mouth slightly descending. Teeth, 4.2-2.5 j isthmus rather wide. Eye
<br />not large; in adults six times in length of head, 1. 7 5 times in muzzle, and
<br />. twice in interorbital width. The fins are all rather small, including the cau-
<br />dal j the pectorals reach 0.6 the distance to the ventrals, and the latter 0.6 the
<br />distance to the anal. Radii: D. 1. 8; A.1. 8; V.9. Least depth of caudal
<br />peduncle 2.6 times into greatest depth (in front of dorsal fin), which enters
<br />the length without the caudal fin four times. Total length, om.235 (7!
<br />inches) j length to basis of first dorsal ray, om.113 j length to basis of caudal
<br />fin,Om.200.
<br />General color black. Lower surfaces olive.
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<br />. L_~~--t- L=lilY. \ D." I Coil"'"
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<br />204 Ash Creek, Ariz _' .._._' __u. ._...' ...... July, 1874 Dr. J. T, Rothrock.
<br />\ '0'9 \ s.n Cu'o" .."" .. ...... .........H. ......\ Oct., ,8" H. W, H,~h.w.
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<br />GILA ROBUSTA, Bd. & Gir.
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<br />Gila robusta, ED. & Gm., Pl'oc. Acad. Nat. ScL Phila., vi, 1853, 36!J.-lid., Sitgreave's
<br />Exp. Zuiii & Col. Riv., 1853, Fishes, 148,p1. 1, f. l.-,-Iid., P. R. H. Rep., x,
<br />1857, ]?ishes, 285.
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<br />A comparison of two good specimens with Baird and Girard's descrip-
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<br />tion reveals some trifling differences with regard to number of radii. Speci-
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<br />men No. 504, from Zuni River, Now 1\Iexico, has the following formula:
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