1903.] Allen, Mammals from Northern British Columbia. 555 



[In a small collection of mammals made by Mr. Frank M. 

 Chapman at Glacier, B. C., in July, 1901, is a single specimen 

 of Synaptomys that seems specifically distinct from any pre- 

 viously recognized, and which I take the present opportunity 

 to describe. 



Synaptomys (Mictomys) chapmani, sp. nov. CHAPMAN LEM- 

 MING VOLE. 



Type, No. 16908, $ ad., Glacier, Selkirk Range, British Columbia, 

 July 20, 1901 ; Frank M. Chapman, for whom the species is named. 



Above grayish brown, with a slight suffusion of buff, strongest on 

 the front of the head, the whole region in front of the eyes being con- 

 spicuously washed with buff; ventral surface dark gray, the plumbeous 

 underfur being slightly tipped with whitish, not sharply defined 

 against the sides; ears large, colored like surrounding pelage; feet 

 dusky grayish brown; tail very short, darker above than below, well 

 pencilled. Side glands in front of hips covered with conspicuously 

 lighter fur, almost whitish. 



Total length, 134; tail vertebrae, 21 ; hind foot, 20; ear (from notch, 

 in dry skin) , 1 1 ; prominent above the fur. Skull : Naso-occipital 

 length, 26; basal length, 24.5; -zygomatic breadth, 15.2; mastoid 

 breadth, 11.5; interorbital constriction, 3; length of braincase, 13.5; 

 length of rostrum (front edge of nasals to braincase), 12.2; length of 

 nasals, 6.6 ; length of palatal foramina, 5 ; length of upper toothrow, 7 . 

 Compared with 5. andersoni it is much larger, and the general form of 

 the skull is narrower, with a relatively narrower braincase and more 

 elongated rostrum; the incisive foramina are much longer and nar- 

 rower, and the audital bullae much smaller and less inflated; last loop 

 of last upper molar large, as in S. andersoni, and the reentrant angle 

 on the outer border of last lower molar is also strongly marked. 



Unfortunately this species is represented only by the type, 

 an old male, taken at Glacier, B. C., by Mr. Chapman in July, 

 1901. Externally the species seems to be well characterized 

 by its very short tail and large ears, the dark grayish brown 

 color of the upper parts and buffy nose. The narrow skull, 

 elongated rostrum, and small bullae seem to distinguish it 

 from its more northern allies. The presence of this species in 

 the Selkirks extends considerably to the southward, especially 

 in the West, the previously known range of the subgenus 

 Mictomys.} 



