MILLER AND REHN: NORTH AMERICAN MAMMALS. 
303 
Arvicola insperatus Allen. 
1894. Arvicola insperatus Allen, Bull. Amer. mus. nat. hist., 
VI, p. 347. December 7, 1894. 
Type locality. — Caster, Black Hills, Custer County, South 
Dakota. 
Regarded by Bailey (North Amer. fauna, no. 17, p. 20, June 6, 
1900) as identical Microtm pennsylvanicus modestus (p. 117). 
Arvicola microcephalus Rhoads. 
1894. Arvicola (Mynomes) microcephalus Rhoads, Proc. acad. 
nat. sci. Phila., p. 286. October 23, 1894. 
Type locality.— Lac la Hache, Britisli Columbia, Canada. 
Regarded by Bailey (North Amer. fauna, no. 17, p, 22, June 6, 
1900) as identical with 3Iicrotus drummondii (p. 117). 
Microtus stonei Allen. 
1899. Microtus stonei Allen, Bull. Amer. mus. nat. hist., xii, 
p. 6, March 4, 1899. 
Type loclvlity. — Liard River, British Columbia, Canada. 
Regarded by Bailey (North Amer. fauna, no. 17, p. 22, June 6, 
1900) as identical with 3L drummondii (p. 117). 
Microtus insularis Bailey. 
1898. Microtus insularis A Proc. biol. soc. Washington, 
XII, p. 86. April 30, 1898. 
Preoccupied by Lemmus Nilsson (Ofver. k..vet. akad. 
forh., Stockholm, i, p. 33,1844) and replaced by Microtus neso- 
2 )hilus Bailey (p. 118). 
Microtus vellerosus Allen. 
1899. Microtus vellerosus Allen, Bull. Amer. mus. nat. hist., 
XII, p. 7. March 4, 1899. 
Type locality. — Liard River, British Columbia, Canada. 
Regarded by Bailey (North Amer. fauna, no. 17, p. 48, June 6, 
1900) as identical with M. mordax (p. 122). 
Microtus cautus Allen. 
1899. Microtus cautus Allen, Bull. Amer. mus. nat. hist., 
XII, p. 7. March 4, 1899. 
Type locality. — Hells Gate, Liard River, British Columbia, 
Canada. 
Regarded by Bailey (North Amer. fauna, no. 17, p. 48, June 6, 
1900) as identical with M. mordax (p. 122). 
