. 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. 2*72 BULLETIN 56, UNITED STATES NATIONAL MUSEUM. ), killed August 31, 1893, had completed the post-breed- ing coat. An immature female (No. 58901 ), September 7, 1893, is in complete summer pelage and of a brighter orange-buff than any other in the series. In this specimen the permanent pre- molar is just replacing
. 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. 2*72 BULLETIN 56, UNITED STATES NATIONAL MUSEUM. ), killed August 31, 1893, had completed the post-breed- ing coat. An immature female (No. 58901 ), September 7, 1893, is in complete summer pelage and of a brighter orange-buff than any other in the series. In this specimen the permanent pre- molar is just replacing its predecessor and the squirrel is two-thirdS grown. The three remaining specimens (adults; September 5 to 29, 1893) illustrate the au- tumnal chalige. Measurements (average of 8 adiilt specimens from San Luis Mountains, near Monu- ment No. 65).âLength, 554 mm.; tail to end of verte- brae, 279; tail to end of hairs, 359; expanse of tail hairs, 160; ear from crown, 24; ear from notch, 33; hind foot, 77. 0 r anial characters.â Skull (fig. 43) similar to that typical of Sciurus rwfi- venter, but relatively broad (66 by 37 mm. in S. rufl- venter against 65 by 37 in S. apache). It is low, flat- tened superiorly,, with the nasals very flat; rostrum rather â high; audital bullae much larger than in S. nif,- venter; ' incisive foramen and interpterygoid fossa long, as in the fox squirrel group. Habits and local distribution.âDr. A. K. Fisher collected a speci- men of the Apache squirrel in the Chiricahua Mountains, south- eastern Arizona. I have only seen it in the San Luis Mountains, in the vicinity of Monument No. 65, where it ranged from 1,700 to 2,100 meters in altitude. Nests were seen in the oak zone from 1,700 to 1,800 meters. It was not observed at the summit. Its favorite food appeared to be the acorn of Quercus hypoleuca, and most of the nests were placed in trees of that species. A female shot in Tur- key Canyon, San Luis Mountains, Chihuahua, Mexico, July 11, 1892, co
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