. 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. 370 BULLETIN 56, UNITED STATES NATIONAL MUSEUM. usually white in Onychomys, mixed with fulvous. Tail with a dorsal stripe of drab extending nearly to the end. Young, smoke-gray, vary- ing to mouse-gray with age. Cranial and dental characters.—The skull (fig. 60a) of this species is heavy and has the supraorbital ridges de- veloped
. 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. 370 BULLETIN 56, UNITED STATES NATIONAL MUSEUM. usually white in Onychomys, mixed with fulvous. Tail with a dorsal stripe of drab extending nearly to the end. Young, smoke-gray, vary- ing to mouse-gray with age. Cranial and dental characters.—The skull (fig. 60a) of this species is heavy and has the supraorbital ridges de- veloped as an appreciable beading. Compared with Onychomys paUescens and 0. melanophrys,- it is perceptibly narrower. The interpterygoid fossa appears to be slightly longer. Alto- gether the skulls and teeth of these three forms—longipes (figs. 606 and c), paUescens, and melanophrys—are quite similar, which fact leads to the sup- position that they may iiltimately prove to be but geographic races of a common species. The rostrum and nasals of longipes are slightly shorter than in paUescens, the adjoining form on the west. Measurements of 8 specimens of Onychomys Fig. 60.—Onychomys longipes. a, Skull b, LOWEE MOLAKS; C, UPPEK MOLAES. Museum number. a S 1 o Locality. Date. Sex and age. i o 1. 4A . (a 1 1 21183 21182 37006 37087 37003 37004 57005 2183 2232 2173 2177 2176 2275 2179 2178 Fort Clark, Kinney County, 'do 1893. Jan. 1 Jan. 17 1892. Dec. 29 Deo. 31 Dec. 30 Feb. 6 Dec. 31 .... d'ad. cf ad. (fad. ?ad. S juv. d'im. ?juv. ? juv. mm. 173 168 167 163 156 161 141 141 mm 57 58 55 S3 54 65' 50 50 771771. mm. do .... 21185 do 21179 do 21194 .do 21184 do 21181 do 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 wor
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