. An account of the mammals and birds of the lower Colorado Valley : with especial reference to the distributional problems presented . of the animals of the region, either directlyor indirectly. Among birds, characteristic permanent residents are the crissalthrasher and Abert towhee. The Colorado river wood rat {Neotoma albigulavenusta) is a characteristic mammal. Photograph taken near Pilot Knob, May11, 1910. 1280] UNIV. CALIF. PUBL. ZOOL. VOL. 12 [GRINNELL] PLATE 6. <•- ,

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbirds, booksubjectmam