. An account of the mammals and birds of the lower Colorado Valley : with especial reference to the distributional problems presented . th from Melleu, Arizona, and toward the groupof spire-pointed hills known as The Needles. The Colorado River in theright distance. Typical rocky mesa in the immediate foreground, the scatteringplants being creosote bushes. The desert mesa is here seen to abut closely uponthe river, leaving only very narrow riparian strips. Mammals trapped on themesa at this point were Perognathus intcrmcdius and Ammospermophilus taken February 28, 1910. Fig.
. An account of the mammals and birds of the lower Colorado Valley : with especial reference to the distributional problems presented . th from Melleu, Arizona, and toward the groupof spire-pointed hills known as The Needles. The Colorado River in theright distance. Typical rocky mesa in the immediate foreground, the scatteringplants being creosote bushes. The desert mesa is here seen to abut closely uponthe river, leaving only very narrow riparian strips. Mammals trapped on themesa at this point were Perognathus intcrmcdius and Ammospermophilus taken February 28, 1910. Fig. Photograph taken March 7, 1910, on the Arizona side, from upperslope of The Needles. Channel of the Colorado River at extreme left. Thechief vegetation on the steep rocky slopes is the creosote bush and Enceliafarinosa. The latter reappears so persistently upon such ground that its namehas been selected to apply to the association marked by its presence. Mammalstrapped on this slope were Neotoma intermedia desertorum. Perognathus inter-medius and Ammospermophilus harrisi. [2S8] UNIV. CALIF, PUBL ZOOL. VOL 2 [GRINMELL] PLATE. Fig. 14
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbirds, booksubjectmam
