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<br />0, <br /> <br />o <br /> <br /> <br />; <br /> <br /> <br /> <br />'O-'~ ~.;-: <br /> <br />2b. Dorsal rays 10 or 11; anal rays 10 or 11; bock, breast, bellv and much <br />of caudal peduncle often naked or with minute, deeply imbedded scoles; <br />caudal peduncle 5.0-6.5 in head____Bonytail Chub, Gila robusta elegan. <br />1 b. Caudal peduncle deep; rudimentary rays of' the caudal fin not greatly en- <br />larged; scoles larger, less than 70 in lateral line; anal rays 8 _____ <br />________~________________________Rio Grande Chub, Gila nigrescen. <br /> <br />Rio Grande Chub <br /> <br />Gila nigrescens (Girard) <br /> <br /> <br />CAUDAL PEDUNCLE <br />DEEP <br /> <br />RUDIMENTARY RAYS NOT <br />ENLARGED <br /> <br />BodV elongate, little compressed, subterete; head rather long and pointed; <br />mouth moderate, oblique, terminal, the jaws about equal, maxillary reaching <br />front of eye; eye 4-5.5 in head; scoles moderate 15 to 17, 55-67, 1 Oor 11; <br />lateral line decurved; dorsal behind pelvics, its tip when depressed reaching <br />posterior base of anal; pectorals nearly reaching pelvics; caudal peduncle deep- <br />er than in following species, about 2 in head; dorsal fin with 8 rays; anal fin <br />with 8 rays; pharyngeal teeth 2, 5-4, 2, without grinding surface. <br />Color, dusky above, silvery below; sides sprinkled with purplish- <br />blue chrornatophores; dorsal, caudal sprinkled with dusky; axil of <br />pectorals and pelvics and body at base of anal yellowish to orange' <br />red. <br />The Rio Grande Chub occurs in the Rio Grande drainage. It is <br />fairly common. Its life historyis unknown. <br /> <br />8anytail Chub <br />Gila robusta elegans Baird and Girard <br /> <br />ENLARGED <br />RUDIMENTARY RAYS <br /> <br /> <br />VERY NARROW <br />CAUDAL PEDUNCLE <br /> <br />-..... - <br /> <br />._.' .. ~{ :_~. ~. ..,.-,. ,-,!.....f. <br /> <br /> <br /> <br />~~.' ...,,'~ <br /> <br />.' ;: ,~_"': '", ~ : <br /> <br />"t <br />