RODENTIA: CRICETIDAE 583 



Canadian Field-Nat., vol. 57, p. 106, Dec. 10, 1943 ; and as valid by Dalquest, 

 Univ. Kansas Publ. Mus. Nat. Hist., vol. 2, p. 356, Apr. 9, 1948.) 

 1895. Microtus principalis Rhoads, Amer. Nat., vol. 29, p. 940, October 1895. 



(Mount Baker Range, British Columbia, Canada.) 

 1900. Microtus richardsoni arvicoloides V. Bailey, North Amer. Fauna No. 17, 



p. 62, June 6, 1900. 

 Type Locality.— Lake Keechelus, Kittitas County, Wash. Altitude, 8,000 feet. 

 [ = 3,000 feet] . Range. — From various mountain ranges (Monashee Mountains, 

 Rossland; Cascade Mountains, Hope-Princeton summit; McGillivray Creek; 

 Coast Range, Lihumitson Park, Alta Lake) in southern British Columbia 

 (regarded as richardsoni by Anderson, Nat. Mus. Canada Bull. 102 (1946), p. 

 162, Jan. 24, 1947) ; southward through Cascade Mountains (Tomyhoi Lake 

 south to Potato Hill) of Washington (Dalquest, loc. cit.) and of Oregon to Crater 

 Lake (V. Bailey, North Amer. Fauna No. 55 (June), p. 211, Aug. 29, 1936). 



Microtus richardsoni macropus (Merriam) f* 



1891. Arvicola (Mynomes) macropus Merriam, North Amer. Fauna No. 5, 



p. 60, July 30, 1891. (Regarded as identical with richardsoni by Anderson, 



Nat. Mus. Canada Bull. 102 (1946), p. 162, Jan. 24, 1947; and as valid by 



Dalquest, Univ. Kansas Publ. Mus. Nat. Hist., vol. 2, p. 356, Apr. 9, 1948.) 



1900. Microtus richardsoni macropus V. Bailey, North Amer. Fauna No. 17, 



p. 61, June 6, 1900. 

 Type Locality. — Pahsimeroi Mountains, head of Pahsimeroi River, Custer 

 County, Idaho. Altitude, about 9,700 feet. Range. — Blue Mountains section of 

 northeastern Oregon, including Wallowa Mountains, Baker Range, Strawberry 

 Butte, in Canadian and Hudsonian Zones (V. Bailey, North Amer. Fauna No. 55 

 (June), p. 212, Aug. 29, 1936), Blue Mountains of southeastern Washington 

 (Dalquest, Univ. Kansas Publ. Mus. Nat. Hist., vol. 2, p. 356, Apr. 9, 1948) ; 

 eastward through mountainous portions of Idaho (Davis, The Recent mammals of 

 Idaho, p. 322, Apr. 4, 1939) and high Uinta and Wasatch Mountains, as far 

 south as Fishlake Mountains in Utah (Durrant, Univ. Kansas Publ. Mus. Nat. 

 Hist, vol. 6, p. 376, Aug. 10, 1952) to Wyoming and Montana (V. Bailey, 

 loc. cit.). 



Subgenus MICROTUS Schrank 



1894. Tetramerodon Rhoads, Proc. Acad. Nat. Sci. Philadelphia, vol. 46, p. 

 282, Oct. 23, 1894. (Type, Arvicola tetramerus Rhoads.) 



pennsylvanicus — group 39 



Microtus pennsylvanicus pennsylvanicus (Ord)* 



1815. Mus pennsylvanica Ord, in [Guthrie], A new geographical, historical, 



and commercial grammar; . . . , Philadelphia, ed. 2, vol. 2, p. 292. 

 1884. Arvicola riparius riparius True, Proc. U. S. Nat. Mus., vol. 7 ( App., Circ. 



29), p. 597, Nov. 29, 1884. (Part.) 



1895. M[icrotus] pennsylvanicus Rhoads, Amer. Nat., vol. 29, p. 940, October 

 1895. 



89 Canadian subspecies reviewed by Rand, Canadian Field-Nat., vol. 57, Nos. 7-8 (October- 

 November 1943), pp. 115-123, Jan. 24, 1944. 



