ALLEN: AMERICAN COLLARED LEMMINGS. 535 



Measurements. The collector's measurements of two skins from 

 EUesmere Land, are (reduced to millimeters) : — total length 106, 107; 

 tail 9.5, 8; hind foot 16, 14. The skull measures (M. C. Z. 10,733); 

 basal length 27.5; palatal length 17; zygomatic breadth 19; mastoid 

 breadth 14.1; nasals 9; upper tooth-row (alveoli) 7.5; lower tooth- 

 row, alveoli 6.5. 



Molt. — In northeast Greenland, Manniche (1910) found that the 

 hair changes toward the end of May, or in some specimens, a trifle 

 earlier. The two specimens from Bache Peninsula, EUesmere Land, 

 in the collection of the M. C. Z. show variation in the assumption of 

 the summer pelage. The older specimen, taken June 14th, has the 

 full summer coat, whereas the younger one (taken June 15th) is less 

 advanced, and although it has shed the white winter coat, it retains 

 the enlarged fore claws, and its back is in the gray stage, where the 

 short new fur has not yet fully grown out. A very faint dark median 

 line is present. On the sides of the body the new fur has come in to 

 nearly its full length and the reddish collar appears at the fore should- 

 ers. An adult from Cape Mercy, Baffin Land, 20 May, 1878, is in a 

 peculiar condition of change. On the forehead and shoulders new 

 buff-tipped hairs are coming in over an oval area, and along the sides 

 the bright tinge of rusty is well developed, passing into gray on the 

 hips, while the old white fur of winter is retained conspicuously be- 

 tween these two areas. The white winter pelage is assimied in late 

 September, before the snows come on. 



Geographic distribution. — The Greenland Collared Lemming is 

 found from about latitude 69° N. on the east coast of Greenland, 

 northward to the limit of land, 83° 24', and thence westward along 

 the coast of North Greenland to the Kane Basin, and across the 

 Robeson Channel to Grinnell Land, EUesmere Land, and south to 

 Baffin Land. Jameson Land, (N. lat. 71°) where Scoresby obtained 

 the original specimen, is near the southward limit of its range in East 

 Greenland, but more recently, Jensen, in 1900, collected specimens 

 still farther south at Cape Dahon (about N. lat. 69°). From this 

 point northward along the coast, it is common and has been traced 

 northeastward to Lambert's Land and beyond to 83° 10' N., where 

 Koch and Bertelsen, of the Danish Expedition 1906-1908, discovered 

 its presence at the close of their survey of this last link in the outline 

 of Greenland's north coast. Greely (1886) had previously reported 

 its discovery by Lockwood in May, 1882, at various points from Mary 

 Murray Island in 83° 19' N. lat., to Lockwood Island, 83° 24' N. 

 It is unlikely that it occurs far inland from the coast at any point, 



