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<br />60dy elongate, somewhat compressed, the region before the dorsal elevated,
<br />forming (I moderate to high arch or nuchal hump; coudal peduncle long and
<br />slender, least depth 5-6.5 in heod length; bock, breast, belly and much of
<br />caudal peduncle often naked or with minute, deeply imbedded scoles; scales
<br />75-88 In lateral line; dorsal fin rays 10 or 11; anol fin rays 10 or J 1; rudimentary
<br />rays of caudal fin excesSively developed; pharyngeal teeth' 2, 5-4, 2; expansive
<br />falcate fins.
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<br />~loration, bluish above, pale below.
<br />The Bony tail Chub is found in the very swift waters of the Colo-
<br />rado River system. It may attain a length of 18 inches. but little
<br />. else is known about its life history.
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<br />Roundtoil Chub
<br />Gila robwta robusta Baird and Girard
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<br />ENLARGED
<br />RUDIMENTARY RAYS
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<br />CIF 11:
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<br />. deep.
<br />mat fin
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<br />NARROW
<br />CAUDAL PEDUNCLE
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<br />Irplish.
<br />axil of
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<br />Body elongate, back slightly elevated or arched, mostly In large sp<<lmens;
<br />caudal peduncle notably stouter than, in G. r. elegans, its least depth 3.3-4.3 in
<br />&wad length; scales 79-96 in lateral line; teeth 2, 5-4, 2; dorsal nIy5 usually 9;
<br />anal rays usually 9; moderately large, slightly falcate fjns; body fully scaled.
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<br />Coloration, silvery with dusky or light green dorsally. dorsal also
<br />lightly speckled; area around base of pectoral, pelvic and anal fins
<br />yellowish to orange.
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<br />_ The Roundtail Chub is found only in the Colorado drainage in
<br />less swift waters than G. r. elegans. It reaches a length of 15 inches.
<br />It is carnivorous with insects its primary food. The ftah is full of
<br />bones and thus it is of no value as food.
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<br />The Redbelly Dace
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<br />Genus Chrosomw Rafinesque
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<br />. Body moderately elongate, little compressed; no barbel, jaws normal; pre-
<br />maxlllarles protractile, teeth 5-5 or 5-4, moderately hooked, with well-marked
<br />..sIrlndlng surface; alimentary canal twice length of body; peritDneum black;
<br />clonal rays 8; anal rays 8; scales very small; lateral line wcmting or incom-
<br />plete; size small, not over 3 inches.
<br />One species 15 represented in' Colorado.
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