198 
PSEUDOSTOMA BOREALIS.-Ricii. MSS. 
The Camas Rat. 
PLATE CXLII. Male, Female, and Young. — Natural Size. 
P. Ex cinereo fulvus, cauda longa pilosa ; P. bursario minor, et gracilior, 
dentibus unguibusque minoribus. 
CHARACTERS. 
Smaller and of more delicate form than Pseudostoma bursarius, and teeth 
and claws much smaller. Tail, long , and clothed, with hair. Colour, pale 
yellowish-gray. 
SYNONYMES. 
Geomys Borealis. Rich., MSS. 
Pseudostoma Borealis. Bach., Jour. Acad. Nat. Sciences Philadelphia, vol. viii. 
part 1, p. 103. 
Geomys Townsendii. Rich., MSS. 
DESCRIPTION. 
Head, of moderate size ; ears, consisting of a small round opening mar- 
gined by an elevated ridge, the highest portion of which is the posterior 
part, and is about one line in height. The ears not hidden by the fur, 
but distinctly visible. Body, moderately thick ; claws of the fore-feet, 
slender and rather long ; incisors, rather long (but not large for the 
genus) ; the upper ones have each a slight longitudinal groove situated 
close to the inner margin. Tip of nose, naked ; feet, bare beneath ; inner 
toe of fore-feet, rather short, outer next in length, middle longest, and the 
toes on either side of the central one about equal ; there is a long brush 
of stiff white hairs on the inner side of the inner toe. On the hind-feet the 
central toe is longest, outer toes equal and short. Tail, hairy. 
COLOUR. 
General colour, pale gray, the upper parts more or less washed with 
yellow ; inside of pouches, under surface of body, feet, and tail, white. 
