?o 



THE MUSEUM. 



hudsonicits baileyi probably inter- 

 grades at the north with the 

 true 5. hudsonicHs from which it dif- 

 fers in summer pelage, in the more 

 olivaceous and darker tint of the dor- 

 sal surface, in the pale fulvous wash 

 of the ventral surface, and in the red 

 and black grizzled upper surface of the 

 tail. It differs similarly, but in a 

 greater degree, from 5. h. dakotcnsis, 

 which is a much paler form. With 5. 

 Ii. richardsoiiii it scarcely needs com- 

 parison, owing to the darker, deeper 

 red of the upper parts of the latter 

 and its much greater amount of black 

 in the tail. Its nearest ally is .S'. //. 

 I'ciUoruui which is geographically its 

 near neighbor at the southeast, find- 

 ing its eastern limit in the Wind River 

 Mountains while 5. h. baileyi occupies 

 the Laramie, and Bighorn Mountains a 

 little farther to the eastward. The 

 chief difference between these two 

 forms consists in the less yellowish and 

 decidedly darker olivaceous cast of the 

 dorsal surface of S. It. vcntoruni in 

 summer pelage, and the grayness of 

 the lower surface of the tail. What 

 the difference in winter pelage may be 

 cannot now be determined, owing to 

 lack of material. 



Sciurus /utdsoniciis vcntoriiiii, sub- 

 species, nov. Wind River Moun- 

 tains Chickaree. The winter pel- 

 age is not well known yet. Above 

 with a narrow median band of dark 

 colored rufous, narrower and less dark 

 than in 5. h. ricliardsouii but much 

 darker and less yellowish than in 5. h. 

 bailcyi\ rest of dorsal surface and legs 

 and feet gray, suffused with pale yel- 

 lowish, the hairs being yellowish gray 

 ringed with black; a dusky lateral line 

 obscurely indicated; below white with- 

 out (in the specimens examined) black 

 vermiculation; tail above centrally 

 dark yellowish rufous, bounded by the 

 usual zone of black and pale yellowish 

 outer fringe, the black zone being of 

 about the usual width in 5. Imdsoui- 

 cus, S. h. loqiiax and 5. /t. baileyi; 

 the tail' is thus very different from 5. 

 //. richardsoiiii; lower surface of tail 



gray, grizzled sparingly with black. 

 Summer pelage. Above nearly uni- 

 form dark olivaceous, with the sides 

 of the shoulders and outer edge of 

 thighs suffused with strong reddish 

 fulvous; upper surface of feet ochrac- 

 ceous; the dusky lateral line as a rule, 

 narrow and rather indistinct as com- 

 pared with most other members of the 

 .S\ hiidsoniius group; tail above with- 

 out a well defined central area of red- 

 dish (owing to the hairs being narrow- 

 ly but profusely ringed with black) 

 bordered with a zone of black of the 

 usual extent, and broadly fringed with 

 fulvous, with the dark outer border 

 and fulvous fringe as above. Type 

 taken at South P.hss City, Wyoming. 

 Geographical range. Wind River 

 Mountains Region, and northward 

 along the eastern base of the Rocky 

 Mountains to at least Mystic Lake, 

 and probably to the belt ranges east of 

 Helena, and thence westward to the 

 head of Snake River in Idaho and 

 south along the Idaho and Wyoming 

 boundary to the Wasatch Mountains 

 in Northern Utah. Its range thus in- 

 cludes not only the Wind River and 

 Gros Ventre Ranges, but the Sho- 

 shone and Beartooth M-ewntains, the 

 whole of the National Yellowstone 

 Park region, and the outlying regions 

 east of the Main Divide to Central 

 Montana, to the westward and south- 

 ward it includes the Snake River, Car- 

 iboo, Thompson, Blackfoot, Bear Riv- 

 er, Bannock and Wasatch Ranges, 

 with their outlying and included 

 or connected spurs. Sciiir?ts 



hudsonicus ventorum finds its near- 

 est ally in 5. //. baileyi from 

 which it differs in much darker and 

 more olivaceous coloration above; the 

 upper surface of the tail has the rufous 

 of the central area more varied with 

 black, and the under surface is grayer 

 and less suffused with fulvous. The 

 differences are not great, but are real- 

 ly appreciable and fairly constant. S. 

 h. ventoruvi is thus one step nearer S. 

 h. richardsonii, from which it differs 

 strikingly in the less red and more oli- 



