RODENTIA: HETEROMYIDAE 411 



Microdipodops megacephalus megacephalus Merriamf* 



1891. Microdipodops megacephalus Merriam, North Amer. Fauna No. 5, p. 



116, July 30, 1891. 

 Type Locality. — Halleck, East Humboldt Valley, Elko County, Nev. Range. — 

 Northeastern Nevada; from northern Elko County south to northern Nye and 

 Lincoln Counties; and from western Lander County east almost to the Utah 

 boundary (Hall, Field Mus. Nat. Hist. Publ. 511, Zool. Ser., vol. 27, p. 258, 

 Dec. 8, 1941). 



Microdipodops megacephalus oregonus Merriamf* 



1901. Microdipodops megacephalus oregonus Merriam, Proc. Biol. Soc. Wash- 

 ington, vol. 14, p. 127, July 19, 1901. 



Type Locality. — Wild Horse Creek, 4 miles northwest of Lake Alvord, Alvord 

 Desert, Harney County, eastern Oregon. Range. — Arid Upper Sonoran valleys 

 of southeastern Oregon (V. Bailey, North Amer. Fauna No. 55 (June), p. 241, 

 Aug. 29, 1936) ; northeastern California in extreme eastern parts of Modoc and 

 Lassen Counties, from east of Eagleville, in Surprise Valley, south to east end of 

 Madeline Plains north of Observation Peak (Grinnell, Univ. California Publ. 

 Zool., vol. 40, No. 2, p. 165, Sept. 26, 1933) ; and northwestern Nevada north- 

 west of Black Rock and Smoke Creek deserts (Hall, Mammals of Nevada, p. 388, 

 July 1,1946). 



Microdipodops megacephalus calif ornicus Merriamf* 



1901. Microdipodops calij ornicus Merriam, Proc. Biol. Soc. Washington, vol. 

 14, p. 128, July 19, 1901. 



1941. Microdipodops megacephalus californicus Hall, Field Mus. Nat. Hist. 

 Publ. 511, Zool. Ser., vol. 27, p. 250, Dec. 8, 1941. 



Type Locality. — Sierra Valley, near Vinton, Plumas County, Calif. Range. — 

 Intermontane valleys of eastern Plumas County (Hall, loc. cit.) ; and western 

 Nevada from Pyramid in Washoe County southward at least to 31^ miles east of 

 Carson City in Carson River Valley (Hall, Mammals of Nevada, p. 388, July 1, 

 1946). 

 Microdipodops megacephalus nasutus Hall 



1941. Microdipodops megacephalus nasutus Hall, Field Mus. Nat. Hist. Publ. 

 511, Zool. Ser., vol. 27, p. 251, Dec. 8, 1941. 



Type Locality.— Fletcher, Mineral County, Nev. Altitude, 6,098 feet. 

 Range. — Known from type locality only. 



Microdipodops megacephalus poliouotus Grinnell* 



1914. Microdipodops polionotus Grinnell, Univ. California Publ. Zool., vol. 

 12, No. 7, p. 302, Apr. 15, 1914. 



1941. Microdipodops megacephalus polionotus Hall, Field Mus. Nat. Hist. 

 Publ. 511, Zool. Ser., vol. 27, p. 251, Dec. 8, 1941. 



Type Locality.- — McKeever's Ranch, 2 miles south of Benton Station, Mono 

 County, Calif. Altitude, 5,200 feet. Range. — Mono Lake Basin and extreme 

 head of Owens Valley, in Mono County; southeast from south side of Mono Lake 

 to vicinity of Benton and Benton Station; west to Taylor Valley; vertical range, 

 5,200 to 7,000 feet; zonal range, Upper Sonoran and dilute Transition (Grinnell, 

 Univ. California Publ. Zool., vol. 40, No. 2, p. 166, Sept. 26, 1933). 



