Vol. 31, pp. 3-4 February 21, 1918 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



A NEW FLYING-SQUIRREL FROM EASTERN ASIA. 



BY GERRIT S. MILLER, JR. 



[Published here by permission of the Secretary of the Smithsonian Institution.] 



Among some mammals which Mr. Copley Amory, Jr., col- 

 lected for the National Museum in eastern Asia during the 

 winter of 1914-15 is a flying-squirrel that represents a form 

 distinct from any that has hitherto been described. A short 

 account of Mr. Amory's work was published in the Smithsonian 

 Miscellaneous Collections, vol. 66, No. 3, pp. 46-51, May 27, 

 1916, but no general report on his collection of mammals has 

 yet been written. The flying-squirrel may be named and 

 described as follows : 



Pteromys volans incanus, subsp. nov. 



Type. — Adult female (skin and skull; teeth moderately worn), No. 

 200,613, U. S. National Museum. Collected at Verkhne Kolymsk, East 

 Siberia, April 24, 1915, by Copley Amory, Jr. Original number, 374. 



Diagnosis. — Similar to Pteromys volans volans, but general color of 

 upperparts a clear gray almost without trace of buffy suffusion, and tail 

 without noticeable clouding of black. 



Color. — Bases of hairs everywhere deep neutral-gray; on the upper- 

 parts and sides this is overlaid by a whitish gray with a barely perceptible 

 tinge of buff, the two colors blending into a general effect that is near the 

 pallid mouse-gray of Ridgway. Muzzle, cheeks, underparts and area 

 behind ear white with a faint buffy tinge. Edge of ear and dorsum of 

 manus and pes clouded with dusky. Tail nearly concolor with back, 

 but slightly more tinged with buffy along sides and at tip above, and 

 inconspicuously clouded by a sprinkling of long black hairs both above 

 and below. 



Skull and teeth. — The skull resembles that of Pteromys volans volans. 

 It differs from that of the Chinese P. buechneri in its greater size and in 

 the longer narrower form of the interpterygoid space. The teeth show 

 no special peculiarities. 



2— Pboc. Biol. Soc. Wash.. Vol. 31, 1918. (3) 



