214 FIELD MUSEUM or NATURAL HISTORY ZOOLOGY, VOL. XL 



B. Total length less than 5.50 inches; tail I inch or less long. 



Upper parts dark chestnut brown; under parts plumbeous gray, more or less 

 tinged with buff; fur soft, suggesting that of a mole; plantar tubercles 5; 

 mammae 4; claws on fore feet longest. 



MOLE MOUSE or MOLE-LIKE VOLE. 

 Microtus pinetorum scalopsoides , p. 222. 



Subgenus MICROTUS Schrank. 



Plantar tubercles 6; crown of third upper molar with 5 or more 

 irregular loops, the middle ones forming three closed triangles ; mammae 

 8 in our species, 4 pectoral and 4 inguinal. 



Microtus pennsylvanicus (ORD). 

 MEADOW MOUSE. MEADOW VOLE. 



Mus pennsylvanica ORD, Guthrie's Geography, 2nd Amer. ed., II, 1815, p. 292. 



Arvicola riparius, LAPHAM, Trans. Wis. State Agr. Soc., II, 1852 (1853), p. 340 

 (Wisconsin). KENNICOTT, Trans. 111. State Agr., Soc., I, 1853-54 (1855), p. 

 579 (Cook Co., Illinois). Ib., Agr. Rept. for 1856, U. S. Patent Office Rept., 

 1857, p. 104 (Illinois). MILES, Rept. Geol. Surv. Mich., 1860 (1861), p. 221 

 (Michigan). ALLEN, Proc. Bost. Soc. Nat. Hist., XIII, 1869. (1871), p. 193 

 (Iowa). COUES, Monog. N. Amer. Rodentia, 1877, p. 165 (Illinois, Wisconsin, 

 Missouri, etc.). OSBORN, Proc. Iowa Acad. Sci. I, 1887-89 (1890), p. 43 (Iowa). 

 STRONG, Geol. Wis., Surv. 1873-79, I, 1883, p. 439 (Wisconsin). 



Microtus pennsylvanicus RHOADS, Proc. Acad. Nat. Sci. Phila., 1896 (1897), p. 185 

 (Tennessee). BAILEY, N. Amer. Fauna, No. 17, 1900, p. 16 (Michigan, Illinois, 

 Wisconsin, Missouri, Iowa, Minnesota, etc.). SNYDER, Bull. Wis. Nat. Hist. 

 Soc., II, 1902, p. 117 (Wisconsin). HAHN, Proc. U. S. Nat. Mus., XXXII, 

 1907, p. 459 (Kankakee Valley, Indiana). LANTZ, U. S. Dept. Agr., Biol. Surv., 

 Bull. No. 31, 1907, p. 15. McAxEE, Proc. Biol. Soc. Wash., XX, 1907, p. 5 

 (Munroe Co., Indiana). JACKSON, Bull. Wis. Nat. Hist. Soc., VI, 1908, p. 22 

 (Wisconsin). HAHN, Ann. Rept. Dept. Geol. & Nat. Resources Ind., 1908 

 (1909), p. 506 (Indiana). HOWELL, Proc. Biol. Soc. Wash., XXIII, 1910, p. 29 

 (Kentucky). 



Type locality Meadows below Philadelphia, Pennsylvania. 



Distribution Northeastern United States, from northern border of 

 Quebec and Ontario to Virginia and in the mountains of North 

 Carolina and Tennessee west to Nebraska, Minnesota and South 

 Dakota. Occurs throughout about the northern two-thirds of 

 Illinois and the whole of Wisconsin. 



Description Upper parts dark chestnut brown, at times ochraceous 

 chestnut; the fur on back mixed with blackish hairs; sides of body 

 lighter than back; under parts slaty plumbeous, occasionally with 

 a slight wash of pale cinnamon brown; feet brownish; tail dark 

 above, somewhat paler below; other characters as given for the 

 subgenus. 



