. 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 439 Description.—Xhis slight geographical race of Peromyscus eremicus differs from the typical form in being larger, darker with brighter ochraceous coloration, and smaller ears. From the varied .character of its habitat this subspecies is less uniform in size, coloration, and proportions than the
. 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 439 Description.—Xhis slight geographical race of Peromyscus eremicus differs from the typical form in being larger, darker with brighter ochraceous coloration, and smaller ears. From the varied .character of its habitat this subspecies is less uniform in size, coloration, and proportions than the other forms of eremicus. In specimens from the strip of country between the Mimbres Valley and the San Luis Moun- tains the ear is decidedly smaller than that of typical eremicus. West of the San Luis Mountains the ear increases in size and the coloration, as a rule, is darker. In the canyons at the head of the Yaqui River a small, dark-colored phase was found which may prove to be worthy of separation as a subspecies if further differentiated in the lower Yaqui River tract. In this connection I have examined two specimens from Oposura, Sonora (Nos. 8816 and 8817, collec- tion of the American Museum of Natural History, New York), forwarded to me by Dr. J. A. Allen. These are the darkest ones seen, and somewhat larger than two from Guadalupe Canyon (Nos. 58878 and 58879, ) on the International Line at the head of the Yaqui. These four are much like P. tihuronensis, a species inhabiting Tiburon Island, in the Gulf of California, near the mouth of the Yaqui River. The skuU is shown in ng. 11)4. ^ ^ ^ j,jQ 104.—Pekomtscus Habits and local distribution,—When camped eeemicus anthonyi. near Wheatfield, Arizona, October 21, 1884, I set '°J^ll^'' ""^^ °'' out in company with Gen. George Crook in search of Whitney owls {Micropallas whitneyi). Several giant cacti were chopped down, and in a hole in one of them we found a soft nest containing two of these mice, o
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