2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 56 



Remarks. — This chipmunk is not closel}^ related to either Eutamias 

 aifinis or E. horeaiis, but is apparently a northern form of luteiventris. 

 It bears some resemblance to Eutamias felix, but is readily dis- 

 tinguished from that species by its much less reddish coloration. The 

 close similarity between the skulls of fclix, ludibundus, and luteiven- 

 tris, and the general type of coloration exhibited by all three, make 

 it seem possible that series of specimens collected between the known 

 ranges will show intergradation between these forms. At present 

 the material does not warrant treating them as subspecies. From E. 

 horeaiis, with which it does not intergrade, in this region at least, 

 ludibundus may be easily separated by its large size, large foot, red- 

 dish, not gray, tail, and larger skull. Specimens of E. horeaiis were 

 collected by our party at Prairie Creek, and at Brule Lake, Alberta. 

 West of these points, at Henr\^ House, Alberta, and along the British 

 Columbia boundary line, all the chipmunks collected are of this new 

 form. From E. afHnis, this form differs conspicuously in the general 

 color of the back and rump, showing far less clear white, and with 

 rump, legs, and inner light stripes much darker brownish-gray ; 

 cheeks, shoulders, and sides very much darker. I am under obliga- 

 tions to Mr. Arthur H. Howell for pertinent criticism and assistance 

 during my work in this most difficult genus. 



A large series of specimens of this new chipmunk was collected, all 

 from the region along the boundary line between British Columbia and 

 Alberta, from Yellowhead Pass northward. 



CALLOSPERMOPHILUS LATERALIS TESCORUM, subsp. nov. 



Type from head of Moose Pass branch of the Smoky River, Alberta 

 (near Moose Pass, B. C), at 7000 feet. Cat. No. 174165, U. S. 

 National Museum ; skin and skull, male adult. Collected August 2, 

 1911. N. Hollister; original No. 3863. 



General characters. — Nearest to CallospcrniophUus lateralis ciner- 

 ascens, but larger, darker, and richer colored; mantle darker and 

 extending further back over shoulders ; under side of tail clear cinna- 

 mon color with black subterminal border to hairs (in cinerascens the 

 under side of the tail is mixed pale buff and black) ; upper side of tail 

 with less black. 



Color of type.— Nose, top and sides of head, neck and shoulders, 

 glossy Mars brown ; ring around eyes, whitish ; back grizzled brown- 

 ish-gray, darkening on rump. Lateral stripes sharp and distinct, the 

 dark ones clear black from shoulders to middle of body, the posterior 

 half colored like back ; inner black stripes short, reaching only little 



