THE MUSEUM. 



lOI 



are ashy-white, finely and profusely 

 veriniculated with dusky, with only a 

 slight tin),'e of brownish; tail nearly as 

 in .S". //. slrcatori. 



Summer Pelage. Above dark oliva- 

 ceous, sometimes with a tinge of red- 

 dish — nearly as in .V. //. strcalori and 

 .S'. iiou_i^/iis!i; below, white, generally 

 with a tinge of fulvous, varying to a 

 strong wash of pale yellow. 



The geographical range is Vancouver 

 Island, and the coast region of north- 

 ern British Columbia, north at least 

 to Sitka. 



The Alaska specimens appear to be 

 rather smaller than those from \'an- 

 couver Island, but the difTerence is 

 probably more apparent than real, as 

 with a few exceptions the Alaska spec- 

 imens are young of the year, taken 

 mostly in .\ugust, while the \^ancouver 

 specimens are all adult. May and June 

 specimens. The peculiar faint yellow- 

 ish wash below, which is very different 

 in appearance from that of members 

 of the c/otter/asi't group, is quite a pro- 

 nounced feature in vancouverensis, 

 though shared but in less degree, by 

 both strcatori and baileyi. In winter 

 pelage, mvancouvcrcnsis, this pale ful- 

 vous or rusty tint suffuses the heavily 

 vermiculated under surface, which is 

 only a little less prominent, but of a 

 different shade, than in the winter pel- 

 age of 5. douglasii. 



Sciiirus hiidsoniitis vancoitvcrensis 

 was based originally on six specimens 

 in summer pelage from Duncan station, 

 \'ancouver Island. In the original 

 description it was compared with what 

 is here recognized as .V. //. streatori, 

 no specimens of true .S". //. richard- 

 sonii being then at hand. The meas- 

 urements given were only appro.\imate, . 

 being taken from skins badly prepared. 

 The present material makes it possible 

 to give full comparison with its allies. 



i". //. vancoiiverinsis is closely re- 

 lated to .S. h. streatori, with which it 

 intergrades near the coast region of 

 British Columbia. It is a coast form, 

 resembling in coloration .S'. //. ricltani- 

 sonii of the interior mountains, except 



that in winter pelage the ventral sur- 

 face is more heavily vermiculated and 

 more or less suffused with brownish. 

 In this last feature it differs markedly 

 from .S". //. streatori, as well as in 

 being less olivaceous and more suffused 

 with rufous in summer pelage. It is 

 also smaller than .S'. Ii. streatori, and 

 consequently very much smaller than 

 .S. //. richardsonii 



Review of the Sciuriis liudsonicus 

 Group: 



The Sciurus liudsonicus group is 

 made up of a number of closely re- 

 lated, intergrading forms, the most 

 strongly differentiated of which, in 

 their extreme phases, are true .S". liud- 

 sonicus of the Arctic districts, the some- 

 what isolated .S'. Ii. dakotcnsis of the 

 Black Hills region of South Dakota, 

 and .S\ It. richardsonii of the moun- 

 tains of central Idaho and the Coeur 

 d'Alene and Bitter Root regions of 

 northern Idaho and adjoining parts of 

 Montana and Washington. Taking 

 the range of 5. h. richardsonii as a 

 point of departure, we have two pale 

 forms adjoining .S". h. richardsonii on 

 the east and south — o the east and 

 southward the .V. h baileyi, a pale 

 form of the more arid region between 

 the plains and the eastern base of the 

 Rocky Mountains, in central and south- 

 eastern Wyoming and eastern Mont- 

 ana; to the southward 5. Ii 7'cntoruni, 

 a less pale form of the Wind River 

 region and thence southward to the 

 Wasatch range. West of the Rocky 

 Mountains, to the northward, and cut 

 off from the range of S. h ventoriiin 

 by the intervention of typical .S". h. 

 richardsonii s.nA S. douglasii californ- 

 icus, we meet with 5. //. streatori, a 

 pale form of the somewhat arid in- 

 terior of British Columbia, and to the 

 west of this, in the Columbian and 

 Sitkan Coast region (including Van- 

 couver Island; the darker and more 

 heavily vermiculated and suffused .S". h. 

 vancouTcrensis. None of these forms 

 are strongly marked except S. h. rich- 

 ardsonii, which, however, unquestion- 



