MICROTUS. 



lower molar with three closed triangles and eight or nine salient 

 angles; third upper molar with two closed triangles and six salient 

 angles; mamma;, 6; inguinal, 4; pectoral, 2. Soles thickly haired. 



Fig. 40. MiCROTus (Pedomys) austerus 



No. 216 Field Columbian Museum Coll. Nat. size. 



Lower tooth row. Upper tooth row. 



Enlarged 7 times. Enlarged 6 times. 



293. austerus. {A/ru-o/a), Le Conte, Proc. Acad. Nat. Scien. Phil., 

 1853, p. 405. 



?Hypudceus ochrogaster. Wagn. Suppl. Schreb. Saugt., iii, 1843, 

 p. 592.— Allen, Bull. Am. Mus. Nat. Hist. N. Y., 1898, p. 458. 



cinnamomea, Baird, N. Am. Mamm., 1857, p. 541. 



Type locality. Wisconsin. 



Geogr. Distr. Mississippi Valley, southern Wisconsin to south- 

 ern Missouri and Oklahoma; west to eastern Kansas and Nebraska. 



Genl. Char. Size large; ears short; fore feet more than half as 

 long as the hinder; half of sole hairy; tail short, less than one third 

 head and body. Posterior upper molar with three salient angles on 

 either side; anterior lower molar with five internal and four external 

 salient angles, besides the anterior loop. 



Color. Winter Pelage. Above grayish cinnamon, lined with 

 black; sides paler; beneath pale cinnamon. Under fur plumbeous; 

 tail blackish brown above, beneath pale cinnamon. Feet grayish 

 cinnamon. Summer Pelage. Darker above, paler fulvous beneath. 



Measurements. Total length, 125-170; tail vertebrae, 30-40; hind 

 foot, 17.21; ear, 11. 



