XXII. 



Little Vole or Field-mouse, Least Upland Vole, or 



Gray-vole. 



Microtus minor (Merriam). 



(Gr. Microtus, see ante; L. minor, because so much smaller than its near relatives.) 



Arvicola austerus minor Merriam, 1888, Am. Nat. XXII, 



p. 600. 

 Microtus minor Bailey, 1 900, N. A. Fauna, No. 17, p. 75. 

 Type Locality. — Bottineau, Turtle Mt., N. Dakota. 



French Canadian, le petit Campagnol. 



No special Indian names. 



This Field-mouse belongs to the sub-genus Pedomys 

 (Baird, 1857), which is thus characterized by Bailey:^ 



*' Characters of the sub-genus Pedomys: Plantar tubercles, 

 5; side glands, obscure or wanting, rarely discernible; mammae 

 6, inguinal 2-2, pectoral i-i; ears, me- outside 



dium; fur, long and coarse. Skull, 

 high and narrow; molars, with wide re- 

 entrant angles; m^ with 2 closed tri- 

 angles; ml with 3 closed and 2 open - ^^^^^^^ 

 triangles; m2 with anterior pair of FiG.i54-Moiarenaineii)atternofAfi- 



" , ' crotus (Pedomys) austerus (X5). 



triangles confluent; m^ with ^ trans- to mustrate the subgenus. 



^ • 1 1 • (From Bailey, Fauna 17. Biol. Sunr., U. S. 



verse loops, the middle loop sometimes oep.Agr.) 



constricted, or even divided into 2 triangles." 



In addition to the generic (see p. 480) and sub-generic 

 characters the Least Vole has: 



Length, 5I inches (130 mm.); tail, if inches (35 mm.); size 

 hind-foot, f inches (16.5 mm.). 



' N. A. Fauna, No. 17, igoo, p. 73. 



533 



