. Mammals of the Mexican boundary of the United States : a descriptive catalogue of the species of mammals occurring in that region; with a general summary of the natural history, and a list of trees . Mammals; Mammals; Trees; Trees; Natural history; Natural history. MAMMALS OF THE MEXICAN BOUNDARY. 373. crown, ; ear above notch, ; length of hind foot, Skull, 29 by 16 mm. (For teeth see fig. 62.) Color above, dull tawny cinnamon well mixed with black-tipped hairs on the back, and brightest on the sides and rump; eye encircled by a narrow black ring; under parts, feet, and end of
. Mammals of the Mexican boundary of the United States : a descriptive catalogue of the species of mammals occurring in that region; with a general summary of the natural history, and a list of trees . Mammals; Mammals; Trees; Trees; Natural history; Natural history. MAMMALS OF THE MEXICAN BOUNDARY. 373. crown, ; ear above notch, ; length of hind foot, Skull, 29 by 16 mm. (For teeth see fig. 62.) Color above, dull tawny cinnamon well mixed with black-tipped hairs on the back, and brightest on the sides and rump; eye encircled by a narrow black ring; under parts, feet, and end of tail, pure white; tail with a dark drab stripe on basal three-fourths of upper side; ears dusky, mixed with hoary apically, with a black spot on anterior border of outer surface, and with lanuginous tufts inconspicuous. The foregoing description is based on specimens from the Mexican border, on the San Pedro River, Arizona. A series of more than thirty was obtained from that general region (San Pedro and Santa Cruz valleys) and from the Verde Valley in central Arizona. These speci- mens represent the extreme degree of development of the form described from Utah, which Doctor Merriam has named melanophrys, and differ from the type in being larger and darker, with the upper surface duller, more grayish drab, with the flanks and rump less tawny cinnamon. Half-grown young are smoke gray, with hoary tips to the ears and a black spot on their anterior band. They are almost indistinguishable from the young .of 0. longipes, though a trifle paler. When three-fourths grown the coloration is very similar to that of the gray phase of Peromyscus tezanus. Young adults are dull drabish, without the bright cinnamon tint of adults. The changes of color dependent upon the several stages of age and molt may be graded as follows: (1) Gray, fading later to smoke gray; (2) drab gray, (3) broccoli brown, (4) dull tawny cinnamon. Remarks.—As usual, the form of this species from the San Bernar- dino
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