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<br />EXPLORATIONS IN COLORADO AND UTAH. 27
<br />gad, 4; depth, 4N; D. 12; A. 7. Scales 16-80 to S3-13.
<br />ody more elongate than in X. cypho of the swine size, the form resembling that
<br />a Gila ; head flattish above, narrower and less depressed than in X. cypho, the
<br />nut sharper than in X. cypho, projecting considerably beyond the small mouth;
<br />S rather small, but rather larger and more coarsely tuberculate than in X. cypho,
<br />upper with three rows of papill:o, the lower deeply incised.
<br />Nuchal hump, formed by the expanded internenrals, ninth lower than in X.
<br />rho, but forming a sharp keel. This does not extend forward to the nape, there
<br />ing about thirteen scales before it. Surface of nuchal keel seals.
<br />Eye, -74 in head; snout, ?1; interorbital space, °_}. Scales smaller than in X.
<br />rho, small anteriorly, growing ]:inner backward; breast naked; candat peduncle
<br />nder, much slenderer than ill X. cypho,, its least depth LV in its length and 31 in
<br />ad. Caudal fin large, deeply forked, a little longer than head. Dorsal lower than
<br />X. cypho; the longest ray, 11 ill head ; base of fin, 1 Pectoral, 1- in bead, not
<br />telling centrals; the latter to rent.
<br />Color bluish above, pale below. Peritoneum black.
<br />Type in the U. S. National .Museum.
<br />Pantosteus delphinus (Cope). Bluc-hf ad Sucker.
<br />Comwon, especially near the moatrrtains. Specimens taken in Eagle River, Gun-
<br />;u11 Raver at Delta, Lncompaligie River, Rio de Las Aniwas Perdida.1, :uxi Rio
<br />orida. This species reaches a length of about a foot and is well characterized by
<br />small scales and its large lips. Many die ill the rivers after :pawning.
<br />In life, bluish, olive, or gray; lower fins dull oranz(e; Several round dailies of
<br />I along the lateral line, forming all interrupted red band. Scales 06 to 10.5.
<br />Gila robusta (Baird & C,irard.) Roprwf-nail.
<br />Generally common at the foot of the mountains; replaced by Gila clegans in the
<br />'er channels. Found in the Uncompahgre, and in the Gunnison at Delta.
<br />Tire species of Gila are very similar to each other and are probably redrteible to
<br />roe, Or. elegang, G. robiistn, and G. senninn(la. The last-mentioned I have not seen.
<br />Our specimens front the Gamri--?on evidently correspond to Gila robii.yta. Gi.lagr-a-
<br />nri E. & G. seems to be the same. I c:tn not distimmish Lila affimis Abbott from
<br />'la rOLnsta. This species has been reported front the Kansas and the Platte, but the
<br />Ines doubtless came froin (seen River, as no recent collectors have found any species
<br />this type anywhere except ill the basin of the Volorado and Lila Rivers. Gila
<br />acilis 13. & G. is iiot evidently dillerent fr,nn G. rOb,+'eta. G?'Ira nacr•ca Cope, from
<br />neon Itiver, Wyoming, is evidently glue voting, of Gila robitsta. Dr. Gilbert has
<br />acberl independently similar coneln.iuny :is to the synonymy of these Species.
<br />Gila robusta reaches a length of more than a foot. It is full of Small bones and
<br />rr'rar,lecl as worthless for four]. The nuale5 in lilie have the ]Owen tins and lower
<br />]e of the ]read red, and there is a vertical dash of red oil the ,-peeks. Scales 71) to
<br />in the lateral line, those above and heluw smaller.
<br />Gila elegans Baird & Oirard. Bm,ytail.
<br />One specimeu taken in the('.nnnison at-Delta; five ill the Green River. Appar-
<br />itlY not ascending the streams so G,r aS the preceding.
<br />Comparing specimens of similar size, I;ila elegans has a higher nape and back,
<br />are depressed head, slenderer caudal peduncle, larger fins, and smaller Scales on
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