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Reviews species of Gila and treats robusta, elegans, and minacae and intermedia (as subspecies of robusta) in the subgenus Gila. Describes Gila ditaena (from Magdalena system, Sonora & extreme S AZ) as new (in subgenus Temeculina) and contrasts with the geographically proximate intermedia. 1946. Miller, R.R. Gila cypha, a remarkable new species of cyprinid fish from the Colorado River in Grand Canyon, Arizona. J. Wash. Acad. Sci. 36:409-415. Original description of the humpback chub, Gila cvpha (from Grand Canyon), a canyon-dwelling species which had escaped the detection of ichthyologists during 100 years of western exploration. Provides an analysis of characters involving cvpha and various "subspecies" of robusta, including intermedia, seminuda, and elegans. Notes that seminuda seems to represent an intermediate between robusta and elegans. 1948. Hubbs, C., and R.R. Miller. The zoological evidence: correlation between fish distribution and hydrographic history in the desert basins of western United States. Bull. Univ. Utah 38:17-166. Provides an analysis of drainage history of disjunct portions of the Colorado drainage, including the Pluvial White River, Nevada, from which Gila Jordan was subsequently described (next reference). 1950. Tanner, V.M. A new species of Gila from Nevada (Cyprinidae). Great Basin Nat. 10:31-36. The original description of Gila j_ordani (from the Pluvial White R. system, NV), a form subsequently treated by most as a subspecies of robusta. 1952. Beckman, W.C. Guide to the fishes of Colorado. Colo. Game & Fish Dept. Pub. 110 p. A very brief treatment of G. elegans (as subspecies of robusta) and G. robusta with distinguishing characters given. 1954. Winn, H.E., and R.R. Miller. Native postlarval fishes in the lower Colorado River basin, with a key to their identification. Cal. Fish & Game 40:273-285. An early attempt to provide identifying characters for larval Colorado River fishes which succeeds only in 6