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r s r i s i 4 i 376 Robert Rush Miller TABLE II cHANGiNG FIsaN FAUNA- 0 FAISBANHA, pjBIZONA RiVER, 19? BETWEEN BENSON R, - rare. 1846- 1904 1939 1950 Species WA Native species: X - Gila robusta ..................... X X X - - Ptychocheilus lucius .............. R - -- Rhinichthys oaculus.......... •• X X X X X Agosia chrysogaster........... X X X Tiaroga cobitis................... X X X X Meda fulgida .................... X X - Catostomus insignia .............. X - - C.latipinnis ..................... X - X X - - Pantoateus clarki ................. X X Xyrauchen texanus ............... - - - Cyprinodon macularius........... X Introduced species: - X - Ictalurus melas .................. - - X Lepomis cyanellus ................ - Total species: 11 7 5 3 Native ........................ 2 0 Exotic ........................ 0 0 or damp only, in this section but it • In 1959 (June) the river was dry, was flowing farther upstream at Charleston (about 10 miles above Fairbank); here the river contained all the native fishes listed for 1939. the Mexican part of the San Pedro in the spring of 1950 (UMMZ 162680). species of Arizona that persists longest It is noteworthy that the streams, the longfin dace (Agosua in the dwindling waters of sandy chrysogaster Girard), still survives in the many shallow, intermittent Arizona streams, and was by far the commonest fish in the upper San Pedro River in June 1959. The fishes that have disappeared ar d from the lower part of the stream are those that either require pools Catostomus, Pantosteus), long since filled with sand, or a sizable, permanent river with strong current (Ptychocheilus, Xyrauchen) ; . the desert pupfish presumably utilized marshy areas that must have been drained rapidly with the onset of arroyo cutting in 1883 (Bryan, 10 i •