56 BIRDS AND MAMMALS OF EAST SIBERIA PvoLV^ 



Island. It is remarkable for its long, loose pelage, and for the 

 extreme development of pigment on the teeth. It is possible that 

 the shape of the unicuspids in the two forms is less dissimilar than 

 appears from the description alone, but at all events in the new 

 species it is strikingly unlike that of S. araneus, and perhaps indi- 

 cates, in connection with the other characters, a totally separate 

 group. Apparently S. sanguinidens was not rare on the Kolyma 

 River, and it is curious that no representative of the species has yet 

 been found elsewhere except on Saghalien. One of the specimens 

 is remarkable in possessing only four unicuspids on each side of the 

 upper jaw. Apparently it is the fourth upper incisor in each case 

 that is lacking, as the succeeding canine and small premolar are of 

 full size and quite in the tooth-row. 



Sorex macropygmaeus koreni subsp. nov. Koren's Shrew. 



Type, skin and skull, no. 15,085, M. C. Z., adult female, from Nijni 

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

 collected October 19, 1911, by Johan Koren. 



General characters. — Related to S. macro pygmaeus and S. buxtoni of 

 Kamtchatka, but smaller and shorter-tailed, with a brown instead of a 

 reddish cast to the pelage, and a peculiar hoariness due to the pale, sub- 

 terminal rings of the brown-tipped hairs. Skull smaller, with a narrower 

 and flatter brain-case. Teeth as in buxtoni. 



Description. — The type is pale 'Front's brown' above, slightly darker 

 on the rump, paling rather abruptly at the sides of head and body into the 

 dirty white of the venter, which is washed with 'pale buff.' The individual 

 hairs above are dark slat3^ with a subterminal pale ring — which at most 

 is not more intense than the 'pale buff' of Ridgway, 1912, — ^ and tipped 

 with 'Front's brown.' Many of the hairs are not brown-tipped, so that a 

 grayish cast is given to the general color of the upper parts; this is more 

 accentuated in the type than in the five other specimens, though evident 

 in all. Feet clothed with short, silvery white hairs. Tail sharply bicolor, 

 'Front's brown' above, with a marked terminal pencil of long browTi hairs, 

 silvery white below. 



Skull and teeth. — The skull is decidedly smaller than that of buxtoni; 

 the brain-case is narrower and less elevated, and is without the angular 

 shelf -like development behind the orbit. 



The teeth are essentially similar to those of buxtoni, though slightly 



