450 U. S. NATIONAL MUSEUM BULLETIN 205 



Reithrodontomys megalotis megalotis (Baird)f* 



1858. Reithrodon megalotis Baird, Mammals, in Rep. Expl. Surv. Railr. to 



Pacific, vol. 8, pt. 1 (Washington, 1857), p. 451, July 14, 1858. 

 1893. Reithrodontomys megalotis J. A. Allen, Bull. Amer. Mus. Nat. Hist. vol. 



5, p. 79, Apr. 28, 1893. 

 1895. Reithrodontomys megalotis deserti J. A. Allen, Bull. Amer. Mus. Nat. 



Hist., vol. 7, p. 127, May 21, 1895. (Oasis Valley, Nye County, Nev.) 

 1903. Reithrodontomys megalotis sestinensis J. A. Allen, Bull. Amer. Mus. 

 Nat. Hist., vol. 19, p. 602, Nov. 12, 1903. (Rio Sestin, northwest Durango, 

 Mexico. Altitude, 7,500 feet.) 

 1914. Reithrodontomys megalotis nigrescens A. H. Howellf, North Amer. 

 Fauna No. 36, p. 32, June 5, 1914. (Payette, Payette County, Idaho. Sub- 

 sequently regarded as identical with megalotis by A. H. Howell, Journ. 

 Mamm., vol. 20 v No. 3, p. 390, Aug. 14, 1939; and by Dalquest, Univ. 

 Kansas Publ. Mus. Nat. Hist., vol. 2, p. 324, Apr. 9, 1948. See also Davis, 

 The Recent mammals of Idaho, p. 283, Apr. 5, 1939; and Hall, Mammals of 

 Nevada, p. 499, July 1, 1946.) 

 Type Locality. — Between Janos, Chihuahua, Mexico, and San Luis Springs, 

 Grant County, N. Mex. Range. — From Okanagan Valley (Osoyoos Lake and 

 Penticton), British Columbia (Holland, Murrelet, vol. 23, p. 60, Aug. 14, 1942), 

 south through Columbian Plateau of Washington in Upper Sonoran area west 

 of Columbia River and south of Wenatchee Mountains in Kittitas, Yakima, and 

 Benton Counties, north side of Columbia River in Klickitat County, and Okanogan 

 County east of Okanogan River (Dalquest, op. cit., p. 325) ; Great Basin region 

 of Idaho north to Fremont County and eastward probably into Wyoming (Davis, 

 op. cit., p. 281) and south into Utah, excluding region east of Colorado River 

 (Durrant, Univ. Kansas Publ. Mus. Nat. Hist., vol. 6, p. 296, Aug. 10, 1952) ; all 

 Nevada in Sonoran Zone (Hall, op. cit., p. 497) ; dry Upper Sonoran area of 

 Oregon east of Cascades (V. Bailey, North Amer. Fauna No. 55 (June), p. 189, 

 Aug. 29, 1936) ; Great Basin areas and Colorado and Mohave Deserts of Cali- 

 fornia; recorded north, at Montague and Brownell, in Siskiyou County, and 

 Bieber, in extreme northwestern Lassen County, and east of Sierra Nevada, at 

 Goose Lake, near Sugar Hill, eastern Modoc County; west at south, from valley 

 of Colorado River, to Mecca, Riverside County, to Victorville, San Bernardino 

 County, to Tehachapi, Kern County, and through Walker Pass region as far as 

 Bodfish, on Kern River, Kern County; vertical range, from 250 feet below sea 

 level (Eagle Borax Works, Death Valley, Inyo County) up to 7,500 feet above 

 sea level (Little Onion Valley, east flank Sierra Nevada west of Independence, 

 Inyo County) and exceptionally to 11,500 feet (at McAfee Meadow, White 

 Mountains, Mono County) in California (Grinnell, Univ. California Publ. Zool., 

 vol. 40, No. 2, p. 169, Sept. 26, 1933) ; northeastern Baja California; Arizona, 

 and southern New Mexico (V. Bailey, North Amer. Fauna, No. 53 (December 

 1931), p. 162, Mar. 1, 1932) to western Texas (west of Pecos River) and south- 

 western Kansas (Hill and Hibbard, Journ. Mamm., vol. 24, No. 1, p. 22, Feb. 20, 

 1943. Known range in Mexico from vicinity of Puerto de Lobos and Cananea. 

 northern Sonora, southeast on Plateau and in foothills of Sierra Madre to 

 vicinity of Guanajuato. Known vertical range in Mexico from approximately 

 sea level at Puerto de Lobos. Sonora, to approximately 8,500 feet near Guanajuato, 



