. Bulletin - United States National Museum. Science. a, dorsal view; 6, ventral view; c, lateral view. acquired, appearing at first as a dull ochraceous band along the sides, extending over the back at a later period. Five of these young desert mice, in the mixed pelage of the young and adult, were described by Doctor Merriama as a distinct species—"Hesperomys (Vesperimus) anthonyi"—with the statement that three of them were adults, and that "in coloration, proportions, and cranial characters this mouse differs so radically from all previously known species that comparison with
. Bulletin - United States National Museum. Science. a, dorsal view; 6, ventral view; c, lateral view. acquired, appearing at first as a dull ochraceous band along the sides, extending over the back at a later period. Five of these young desert mice, in the mixed pelage of the young and adult, were described by Doctor Merriama as a distinct species—"Hesperomys (Vesperimus) anthonyi"—with the statement that three of them were adults, and that "in coloration, proportions, and cranial characters this mouse differs so radically from all previously known species that comparison with others is ; Fortunately, the name anthonyi can stand for the larger and darker subspecies of Peromyscus eremicus inhabiting the Elevated Central Tract between the eastern and western deserts. ('nt n'ml and dt ntal charactt rs.—The skull (fig. 100) is low7 and flat, with a short rostrum and truncate nasals ending posteriorly considerably in front of the hinder extremities of the premaxillaries. The brain case, though short and flattened, is not so to the exaggerated degree of /'. tuifi/Hcfis. in which it is almost disk shaped. The outer borders of the first and second upper molars have but three salient and two reentrant loops or enamel folds (fig. 101). Habits and local distribution. We found this handsome desert mouse abundant from the Sonoyta River Valley to the western edge of the Colorado desert, where, at the eastern slopes of the Coasl Range Mountains, it blends into the subspecies fraterculus. Those speci- FlG. 101.—P EBOMYSCUS eremicus. Crowns of molar teeth. o, lower series; 6, upper series. dProc. Bioi. Soc. Wash., IV, Apr. ;.. 1887, pp. 1-3. 30(339—No. 56—07 h 28. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institut
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