1903.] Allen, Mammals from Northeast Siberia. 155 



the sides; the hairs individually plumbeous for their basal three 

 fourths, then abruptly pale fulvous and tipped with black; head less 

 fulvous and more grayish; ventral surface soiled yellowish white, 

 strongest over the pectoral region, the plumbeous underfur well con- 

 cealed by the light tipping of the hairs; feet soiled grayish white with 

 a faint buffy tinge above, dull brownish gray beneath; ears with a 

 narrow pale rim, the long hairs within pale buffy gray, the short hairs 

 clothing the outer surface dusky plumbeous; nose and upper lip dusky 

 brownish, sides of nose lighter, buffy gray. 



Measurements. Head, 43 mm.; body, no; total length (approx- 

 imate), 153; hind foot, 24; ear from crown, 12. (Correct measurement 

 of the length in a straight line is difficult owing to the rigidity of the 

 specimens and their bent positions.) 



Skull. Total length, 37 mm.; basal length, 29; zygomatic breadth, 

 14; mastoid breadth, 19; length of palatal floor, 3 ; length of nasals, 

 10.8; upper toothrow, 7. 



This species appears to differ strongly from O. littoralis 

 (Peters), from the eastern end of the Chukche Peninsula, 

 in general coloration, and especially in the absence of all 

 trace of ferrugineous on the sides of the neck and throat, and 

 it is also larger. It differs from 0. hyperboreus (Pallas), also 

 from the Chukche Peninsula, in its somewhat larger size 

 and in having the upper parts pale yellowish brown instead 

 of ferrugineous. It appears to have no very close relation- 

 ship with O. alpinus (Pallas), from the Altai Mountains, differ- 

 ing from it in coloration and smaller size. 



19. Lepus gichiganus, sp. nov. 

 GICHIGA HARE. 



Type, No. 18286, $ ad., Gichiga, west coast of Okhotsk Sea, Jan. n, 

 1901; N. G. Buxton, Jesup North Pacific Expedition. 



Winter pelage, pure white, generally to the extreme base of the 

 underfur; in some specimens the extreme base is pale gray. Ears 

 narrowly tipped with black. 



Summer pelage, head and back gray-brown tinged with yellowish 

 brown; sides, lower back, rump, and thighs clear dark gray; ears tip- 

 ped with dark yellowish brown. 



Measurements. Total length (type), 584 mm.; tail vertebrae, 75; 

 hind foot, 173; ear from notch (in dry skin), 78. Skull, total length, 

 93; basal length (Hensel), 74; postpalatal length, 55; greatest zygo- 

 matic breadth, 49; mastoid breadth, 33; postorbital constriction, 19; 

 length of nasals, 38; breadth of nasals at base, ai; length of upper 



