206 BULLETIN NO. VIL. 
SuBGENUS PEDOMYS, BaIrbD. 
Though no member of the sub-genus has been encountered 
in the progress of these investigations, it is certain that parts 
of Minnesota fall within the range of P. austerus as well as, 
possibly, of P. curtatus. 
The characters given by Coues are as follows: 
‘‘Postero-superior molar with an anterior transverse loop, 
two interior triangles, one exterior triangle, and a posterior 
U., V-, or Y- shaped loop (as in Pitymys and Chilotus). 
Medio-superior molar with an anterior, two exterior, and only 
one interior triangle (lacking the supplementary postero-inter- 
ior spur or triangle of Myonomes). Antero-inferior molar with 
a posterior transverse loop, two interior closed triangles, one 
exterior closed triangle, another exterior and another interior 
open triangle, and an anterior irregular trefoil. * * Perfect 
plantar tubercles only five.” 
Arvicola (Pedomys) austerus Lec. 
Very similar to Arvicola riparius but more compactly formed, 
and with harsher pelage. The color is a muddy brown above 
and a rusty plumbeous below; four inches long; tail 1.25; hind 
foot 0.70. 
Since writing the above, Dr. Merriam has described* 
a new variety of A. austerus differing from the type chiefly in 
size and living upon the upland prairies. This mouse was first 
collected by Mr. Vernon Bailey, chiefly from Dakota, but the 
range also includes portions of western Minnesota, about Orton- 
ville. The description is sub-joined. 
Arvicola austerus minor MERRIAM. 
“Type 337, male, Merriam collection. From Bottineau, 
Turtle Mt., Dakota, Aug. 27, 1887. 
Description of Type.—Similar to Arvicola austerus, but much 
smaller; length from end of nose to tip of tail vertebree (meas- 
ured in the flesh), 183 mm.; tail vertebrae, 36 mm.; hind foot, 
16.5 mm.; ears rather prominent, slightly overtopping the fur. 
Color.—Upper parts uniform grizzled gray; under parts whit- 
ish, washed with pale cinnamon. Viewed from behind, looking 
away from the light, the whole head, sides and back appear to 

*Dr. OC. HART MERRIAM. Description of a New Prairie Meadow Mouse (Arvicola aus - 
terus minor) from Dakota and Minnesota. American Naturalist, 1888, p. 598. 
