lOO 



THE MUSEUM. 



tana; the Lost River, Salmon River, 

 Pahsimeroi and Saw-tooth Mountains 

 in central Idaho, and westward in the 

 Craig and Seven Devils Mountains to 

 the Powder River and Blue Mountains 

 of Oregon; thence through northern 

 Idaho, and west in the mountains of 

 north-eastern Washington to Colville, 

 and northward into the Kootenai dis- 

 trict of eastern British Columbia. The 

 extent of its range northward along 

 the many Rocky Mountains cannot 

 now be determined, owing to absence 

 of material from the area in question. 

 It appears to reach its maximum of 

 differentiation in the Coeur d'Alene 

 and Bitter Root Mountains, although 

 specimens from central Idaho (the type 

 region) are scarcely distinguishable. 



Sciuriis hudsonicus streatori, subsp. 

 nov. Streator's Chickaree. Winter 

 Pelage. Similar to that of S. h. rich- 

 ardsonii, but with much less black in 

 the tail. Above with the broad dark 

 chestnut rufous median band vermicul- 

 ated with black; below, gray or gray- 

 ish white, the hairs extensively plumb- 

 eous at base, then white strongly ver- 

 miculated with black, giving a gray ef- 

 fect; dusky lateral line generally want- 

 ing or obsolete. Tail above with the 

 central area rufous chestnut, grizzled 

 with black, and occupying nearly the 

 whole surface, being broad and extend- 

 ing nearly four-fifths the length of the 

 tail; a narrow submarginal zone of 

 black, and a subapical broad bar of 

 black; outer fringe pale yellowish, well 

 developed; tail below with a very 

 broad central area of grizzled gray and 

 black, faintly suffused with pale ful- 

 vous. 



Summer Pelage. Above similar to 

 that of S. h. richardsonii, but general 

 color move olivaceous and less rufous; 

 tail, with the black portions greatly 

 reduced and the outer yellowish fringe 

 more developed, essentially as in win- 

 ter. Lateral line very broad and 

 black. There is much variation in the 

 color of the dorsal surface, some speci- 

 mens being dark olivaceous, as dark as 

 in S. douglasii, while others are as 



ruddy as average examples of S. h. 

 richardsonii. 



The geographical range is central 

 part of northern Washington, from the 

 Columbia River northward over cen- 

 tral British Columbia. It occupies 

 the Okanagan district of Washington, 

 from the head of Lake Chelan north- 

 ward. At Lake Chelan and Fort 

 Spokane, it meets S. douglasii with- 

 out intergrading; at Marcus and Con- 

 conully it intergrades with 5. //. rich- 

 ardsonii, which occupies the area im- 

 mediately to the eastward, as it does 

 also in the Kootenai district, in south- 

 eastern British Columbia. 



5. h. strcatori is closely related to 

 S. h. richardsonii, with which it in- 

 tergrades along the western and north- 

 ern border of the range of the latter, 

 namely, in the Kootenai district of 

 British Columbia, and in eastern 

 Spokane Co., Washington. Speci- 

 mens from Fort Spokane, Cheney, 

 Conconully, and Marcus, Washington, 

 are about as well referable to one form 

 as the other. Of five specimens from 

 Marcus, one is typical richardsonii, 

 while the others are streatori. At the 

 westward in the coast region of British 

 Columbia, it intergrades with 5. h. 

 vancouverensis. The northern limit 

 of its range is not at present determin- 

 able. 



It differs from true 5. // richardsonii 

 in the greatly reduced amount of black 

 in the tail, and the more olivaceous 

 tone of its upper surface in summer 

 pelage. It also has a much shorter 

 tail. It differs from .S". //. vancouver- 

 ensis as pointed out under that form. 

 Specimens from Field and Glacier, in 

 the Rocky Mountains, on the line of 

 the Canadian Pacific Railway, shade 

 strongly toward richardsonii. 



Sciurus hudsonicus vancouverensis, 

 Allen. Vancouver Chickaree. Win- 

 ter Pelage. Above like S. h. richard- 

 sonii, except that the black area of the 

 tail is one-half to two-thirds smaller; 

 below, gray with a brownish tinge, 

 sometimes brownish heavily vermicu- 

 lated with dusky; generally the hairs 



