410 U- S. NATIONAL MUSEUM BULLETIN 205 



tude, 3,700 feet. Range. — Recorded also from near Colorado River bridge on 

 south side of Colorado River, Coconino County, Ariz. (Hardy, Journ. Marara., 

 vol. 30, No. 4, p. 435, Nov. 17, 1949) . 



deserti — group 

 Dipodomys deserti deserti Stephensf * 



1887. Dipodomys deserti Stephens, Amer. Nat., vol. 21, p. 42, January 1887. 



1904. Dipodomys deserti helleri Elliot, Field Columb. Mus. Publ. 87, Zool. 

 Ser., vol. 3, No. 14 (December 1903), p. 249, Jan. 7, 1904. (Keeler, Owens 

 Lake, Inyo County, Calif.) 



Type Locality. — Mohave River [bottom at upper crossing on old road from 

 Cajon Pass to Rabbit Springs, 3 or 4 miles from, and opposite, Hesperia], San 

 Bernardino County, Calif. Range. — Colorado Desert district of northeastern 

 Baja California from vicinity of Pilot Knob westward along international bound- 

 ary to base of Coast Range Mountains, thence southward along eastward edge of 

 Pattie Basin, skirting desert base of Sierra San Pedro Martir at least to latitude 

 of San Felipe (Huey, Trans. San Diego Soc. Nat. Hist., vol. 11, No. 10, p. 253, 

 Apr. 30, 1951) ; Colorado and Mohave Desert regions, Calif., north from Mexi- 

 can border to Death Valley and Owens Valley (on east side to Alvord, Inyo 

 County) ; west from Colorado River across Mohave Desert at least to vicinity 

 of Hesperia, San Bernardino County, and across Colorado Desert to Whitewater, 

 Riverside County, and Borego Spring, eastern San Diego County ; vertical range, 

 200 to 3,900 feet; zonal range, Lower Sonoran (Grinnell, Univ. California Publ. 

 Zool., vol. 40, No. 2, p. 165, Sept. 26, 1933) ; extreme northwest arm of Sonora 

 (at El Doctor) , Mexico (Burt, Univ. Michigan Mus. Zool. Misc. Publ. 39, p. 49, 

 Feb. 15, 1938) ; western Arizona (Grinnell, Univ. California Publ. Zool., vol. 12, 

 No. 4, p. 240, Mar. 20, 1914) ; Lower Sonoran Zone of southern Nevada and low 

 western part of State in salt-desert area north to southern Humboldt County 

 (Hall, Mammals of Nevada, p. 428, July 1, 1946) ; and Beaver Dam Wash, in 

 extreme southwestern Washington County, Utah (Durrant and Setzer, Bull. Univ. 

 Utah, vol. 35, No. 26, p. 9, June 30, 1945) . 



Dipodomys deserti sonoriensis Goldmanf* 



1923. Dipodomys deserti sonoriensis Goldman, Proc. Biol. Soc. Washington, 

 vol. 36, p. 139, May 1, 1923. 



Type Locality. — La Libertad Ranch, 30 miles east of Sierra Seri, Sonora, 

 Mexico. Range. — Lower desert coastal area of western Sonora in vicinity of La 

 Libertad and Costa Rica Ranches north to Arizona (Burt, Univ. Michigan Mus. 

 Zool. Misc. Publ. 39, p. 50, Feb. 15, 1938). Recorded from 3 miles east of 

 Picacho, Pinal County, south-central Arizona (Willett, Journ. Mamm., vol. 18, 

 No. 1, p. 101, Feb. 11, 1937). Specimens from southwestern Arizona grade 

 toward this subspecies (Goldman, op. cit., p. 140). 



Genus MICRODIPODOPS 3 Merriam (pigmy kangaroo-rats) 

 1891. Microdipodops Merriam, North Amer. Fauna No. 5, p. 115, July 30, 

 1891. (Type, Microdipodops megacephalus Merriam.) 



3 Revised by Hall, Field Mus. Nat. Hist. Publ. 511, Zool. Ser., vol. 27, pp. 233-275, Dec. 8, 

 1941. 



