. 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. 462 BULLETIN 56, UNITED STATES NATIONAL MUSEUM. REITHRODONTOMYS MEGALOTIS DESERTI Alien. DESERT EARVEST-UOTTSE. BeiArodontomys megaloiis deserti Allen, Bull. Am. Mus. Nat. Hist., VII, p. 127, May 21, 1895 (original description).—Miller and Rbhn, Proc. Best. Soc. Nat. Hist., XXX, No. 1, Dec. 27, 1901, p. 98 (Syst. Results Study N.
. 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. 462 BULLETIN 56, UNITED STATES NATIONAL MUSEUM. REITHRODONTOMYS MEGALOTIS DESERTI Alien. DESERT EARVEST-UOTTSE. BeiArodontomys megaloiis deserti Allen, Bull. Am. Mus. Nat. Hist., VII, p. 127, May 21, 1895 (original description).—Miller and Rbhn, Proc. Best. Soc. Nat. Hist., XXX, No. 1, Dec. 27, 1901, p. 98 (Syst. Results Study N. Am. Mam. to close of 1900). [Beiihrodontomys megaloiis] -paRidus, Elliot, Field Col. Mus., Zool. Ser., II, 1901, p. 152 (part) (Synop. Mam. N. Am.). [Beiihrodontomys longicaudus] paUidus, Elliot, Field Col. Mus., Zool. Ser., IV, 1904, p. 622 (part) (Mam. Mid. Am.). Type-locality.—Oasis Valley, Nye County, Nevada. Geographical range.—From southern Nevada and Inyo County, Cali- fornia, south to the mouth of the Sonora, and Colorado River, Lower California. Description.—Slightly smaller than R. megalotis, with a longer tail; color paler; pelage, shorter and harsher. (Fig. 115.) Measurements.—Average of 10 adult males: Total length, 140 mm.; tail vertebrae, 75; hind foot, 18; ear from crown, Average of 10 adult females: Total length, mm.; tail ver- tebrae, 75; hind foot, ; ear from crown, Remarlcs. — Forty specimens taken along the Colorado River during March, 1894, exhibit but slight individual and age varia- tions. Adults are all pure white below, excepting a few that have clay-colored pectoral patches. They vary some in the intensity of the yellowish color of the up- per surface; Those that are immature are less yellowish than adults, and half-grown young are drab-gray above, grayish white below. A smaller series from Salton and New rivers, on the Colorado Desert, taken during April, closely resemble those from the Colorado, but are a shade pale
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