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<br />PLIWTO::3PONDYLI-CYPH,INIDAE-GILA MON'l'ANA. 657
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<br />Gila nigra, Cope.
<br />Gila egregia, Girard (Tigoma).
<br />Gila nacrea, Cope.
<br />Gila seminuda, Cope and Yanow.
<br />Gila gracilis, Baird and Girard.
<br />, ~J graltmnii, B:'lircl and Girard.
<br />1. ~i_~a elegans,. Baird an. d Giru.rcl.
<br />~a 1-o7msta, Baird and Girard.
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<br />GILA PllLEGETHON'rI::3, Cope.
<br />PLA'l'E XXVU, FIGS. 4, 4a.
<br />Olinostomlls phlegethontis, COPE, Proc. Am. Phil. Soc. Philn., 1874, 137.-Id., Rep. Plagop.
<br />& IeMIly. Utah, 1~74, 11.
<br />Teeth, 1.5-4.2. Body deep, short. Scales larger than in any other
<br />species of the genus, viz, eleven longitudinal and thirty-seven transverse
<br />series. There is no lateral line, which may be due to the immature state
<br />of the only specimen at my disposal. The depth enters the length without
<br />the ealldal fin 3.5 times, while tho kngth of tlw head is counted in the same
<br />four till1es. The orbit is large, entering the head 2.75 times, and 0.2 greater
<br />_ than interorbital width; in older fishes the orbit will be found, as ustH),l,
<br />relatively smaller. The lips are even, and the mouth quite oblique; the
<br />end of the maxillary reaching the line of the orbit. Radii: D.1. 7; A. 1. 8;
<br />the ventrals originate in front of the line of the dorsal, and extend to the
<br />vent, and are not nearly reached by the pectorals. Length without caudal
<br />fin, om.034; length to basis of dorsal, om.018G; length of head, om.oos;
<br />width of head at pterotics, om.oons. A broad plu111heo11s ban(l on the
<br />side, below which the color is golden, above it is probably translucent in
<br />life, with a dusky median dorsal line.
<br />Discovered in Beaver River, Utah, with the ]Jiyloleucus parovanus, by
<br />Dr. H. C. Yanow and H. 'V. Henshaw; abundant.
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<br />GILA I\IO~TA~:,A, Cope.
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<br />Clinostomus lIIontanus, COPE, U. S. Geol. Snrv. Montana &; Adjacent Tcnitories, 1871,
<br />47G.-Id., Proc. Am. Phil. Soc. Phil:!., 1874, 13G.-Jd,, Rep. Plagop. & IcIltl1y.
<br />Utal!, 1874, 10.
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<br />Muzzle decurved, obtuse; .laws equal; end of maxillary extendlJig
<br />4:! 7.
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