54 BIRDS AND MAMMALS OF EAST SIBERIA [^vbf.'v^' 



second is well defined and much larger than the third. The second lower 

 incisor has a minute posterior cusp indicated. 



Measure?nents. — The type measured: total length, 108.5 mm.; tail, 37; 

 hind foot, 14.6. The tail, in a series of ten adults, averages 34% of the 

 total length. The skull measures: condylobasal length, 20.9 mm.; basal 

 length, 18.5; palatal length, 9; greatest width outside last molars, 6; least 

 interorbital width, 4; greatest width of brain-case, 9.3; maxillary tooth- 

 row, 8.8; mandibular tooth-row, 8. 



Remarks. — This remarkable shrew is represented by a good 

 series from the type locality, where it appears to have been the 

 predominant species. Its large size, rather short tail and yellowish 

 brown color, seem to mark it as very distinct from any species yet 

 •discovered in eastern Asia. It possibly is related to S. sinalis, 

 lately described by Oldfield Thomas from central China, but it 

 differs in its proportions and cranial characters. The arrangement 

 of the unicuspids in pairs recalls that of many of the American 

 shrews. The tendency to develop a minute posterior cusp on the 

 crown of the second lower incisor, is an interesting feature, found 

 to a greater degree in S. alpinus of Europe. It does not seem to 

 bear any close relationship to the large, big-clawed unguiculatus of 

 Saghalien Island. Two specimens are albinistic, with whitish 

 areas between the shoulders in one, and on the crown in the other. 



Sorex sanguinidens sp. nov. Kolyma Red-toothed Shrew. 



Type, skin and skull, no. 15,012, M. C. Z., adult female, from Nijni 

 Kolymsk, near the mouth of the Kolyma River, northeastern Siberia, 

 collected December 11, 1911, by Johan Koren. 



General characters. — Apparently related to S. daphaenodon Thomas, of 

 Saghalien Island, but smaller, with a yellowish wash below, and a tricolor 

 summer pelage. Teeth heavily pigmented, and quite different in appear- 

 ance from those of the S. araneus group. The second upper unicuspid is 

 very shghtly smaller than the first, not larger or equal to it as in araneus; 

 the second to fourth form a distinctly graduated series, their tips in side 

 view nearly truncate and broadly rounded off instead of being distinctly 

 pointed. 



Description. — The type in winter pelage is uniform dark brown — prac- 

 tically 'bister' of Ridgway, 1912, — above, becoming hoary on the fore- 



