. An account of the mammals and birds of the lower Colorado Valley : with especial reference to the distributional problems presented . ^r/ .^ji#.#^ irn^- Fig. 19 PLATE 13 Fig. 20. Nest of the Lucy warbler {rermivora luciac) in crevice on side oftrunk of partly dead ironwood shown in plate 12, figure 19. This nest containedthree eggs. Photographed April 12, 1910, on the California side, eighteen milesabove Picacho. Fig. 21. Selected specimens of Mephitis estor from the Colorado Valley:at left, no. 10575, Chemehuevis A^alley, California side; middle, no. 10574, fivemiles south of Needles, Calif
. An account of the mammals and birds of the lower Colorado Valley : with especial reference to the distributional problems presented . ^r/ .^ji#.#^ irn^- Fig. 19 PLATE 13 Fig. 20. Nest of the Lucy warbler {rermivora luciac) in crevice on side oftrunk of partly dead ironwood shown in plate 12, figure 19. This nest containedthree eggs. Photographed April 12, 1910, on the California side, eighteen milesabove Picacho. Fig. 21. Selected specimens of Mephitis estor from the Colorado Valley:at left, no. 10575, Chemehuevis A^alley, California side; middle, no. 10574, fivemiles south of Needles, California side; at right, no. 10579, twenty miles abovePicacho, California side. The variation shown is individual. If the contrastedblack and white markings are of warning signficance. hence of adaptive advan-tage to the species, why should the desert skunks have proportionally muchmore white than skunks from the humid northwest coast belt of the UnitedStates? (See text, p. 256.) [294].
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbirds, booksubjectmam
