*34 Bulletin American Museum of Natural History. [Vol. XIX, 



volans has of late been properly restricted by American writers 

 to the Virginia form of the group. The first name available 

 for the northern Europeo- Asiatic animal is apparently Pter- 

 omys russicus of Tiedemann. (I have not Tiedemann's work 

 at hand, but find this name repeatedly cited for the north 

 European animal.) 



"Russian local name, Lee-tyd-gah. Flying Squirrels are 

 common in the wooded section inland from Ay an, Okhotsk, 

 and Ola, and all over the wooded section westward from 

 Gichiga and in the Kolyma River district. A very few are 

 still found near Yamsk and along the immediate headwaters 

 of the Gichiga River. No. 472 and 486 (pelts) were taken at 

 Yeropole, 160 miles northeast of Marcova, where there is pine 

 timber. Mr. Jochelson says that they are abundant along 

 the Kolyma River as far north as timber line." N. G. B. 



7. Sciurus vulgaris calotus (Hodgson). 

 SIBERIAN SQUIRREL. 



Mustela ? calotus HODGSON, Calcutta Journ. Nat. Hist. 1841, 221- 

 223, pi. ix. Himalaya and Thibet. Type from Thibet, apud Gray, 

 Ann. and Mag. Nat. Hist. (3) XX, Oct. 1867, 272. 



Sciurus calotus GRAY, Ann. and Mag. Nat. Hist. (3) XX, Oct. 1867, 

 272. "Hab. North China, Thibet (Mr. Hodgson's type), Siberia, 

 B. M." 



Sciurus vulgaris calotus BARRETT-HAMILTON, P. Z. S. 1899, 6. "Hab. 

 Eastern Siberia, the exact limits uncertain; . . ." 



? Sciurus vulgaris argenteus KERR, Ann. King. 1792, 256. River Obi. 

 (Cf. Barrett-Hamilton, /. c., p. 6.) 



Ten specimens, collected by Mr. Buxton in February, 1901, 

 "on the Yeropole River, 100 miles northeast from Marcova," 

 are in full winter pelage, with black ear-tufts, black tails, and 

 blackish brown feet. These specimens agree quite well with 

 Mr. Hodgson's description (/. c.), from imperfect skins, of his 

 "Mustela? calotus" which, he says, is "clear slaty blue 

 freckled vaguely with hoary; the amply tufted ears, the 

 spreading tail, and the limbs blackish"; "and the middle of 

 the belly and the neck in the same line, together with the 

 insides of the limbs close to the belly are pure white." 



