ocT.,l'.ioo.] MAMMALS OF THE YUKON KEGION. 43 



imperfect, but enough skulls are now at band to sbow conclusively that 

 all tbe Yukon specimens heretofore identilied as rlcliardsoni are really 

 practically identical witb P. arctlcus from Point Barrow. 



Putorius cicognani alascensis (Merriam). Juneau Weasel. 



A single immature specimen taken %) miles l)elow Fort Selkirk is 

 referred to tbis form. Its skull is ratber large and indicates a possible 

 intergradation with P. arcticus; otherwise it agrees with alascensi-H. 



Putorius rixosus eskimo Stone. Alaska Least Weasel. 



Putor'ms rixosux eskimo Stone, Proc. Acad. Nat. Sei. Phila., Marcli 24, 1900, 44-45. 



No specimens of this rare weasel were obtained. There are three 

 imperfect specimens in tbe National Museum, two from St. Michael 

 and one from Fort Reliance, Besides these tbe only ones recorded 

 are the type and four topotypes from Point Barrow, Alaska, and tbe 

 specimen mentioned by Stone (loc. cit.) from Bethel, Kuskokwim 

 River, Alaska. 



Mustela americana actuosa subsp. nov. Alaska Marten. 



Type (skull) from Fort Yukon, Alaska. No. 6043, U. S. Nat. Mus., $ ad., old. 

 Collected by Robert Kennicott. (See Plate VII, fig. 2. ) 



Characters. — Similar to 3£ hrumalis, but larger; cranial and dental 

 characters distinctive. 



6^>/^r/r.— (Topotype, No. (M16, U.S.N.M., <? ad.): Posterior half of 

 upperparts pale ochraceous buff, shoulders and anterior part of upper- 

 parts gradually becoming grayish; entire upperparts, except head, 

 overlaid with coarse brown hairs; head, including cheeks and throat, 

 pale grayish-white lightly mixed with brown, especiall}^ on nose and 

 chin; inside and edges of ears whitish, outside and bases of ears 

 brown; underparts similar to upperparts, but darker and more brown- 

 ish on chest; an irregular patch of creamy buff mixed with white on 

 chest; legs and feet dark brown, front of legs with mixture of gray 

 hairs; tail brown, somewhat darker at tip, and with a slight mixture 

 of gray hairs. 



/Skull. — Similar to that of 3L h'lmiaHs (Plate VII, fig. 1^), but some- 

 what larger; relatively longer and narrower; interorbital space slightly 

 narrower; audital bullae very much larger and longer; dentition rela- 

 tively much weaker; last upper molar decidedl}^ smaller. 



Measurements. — Average of four adult male topotvpes measured in 

 the flesh by the collector: Total length 26.22 inches (665 mm.); tail 

 vertebra? 8.08 inches (223 mm.); hind foot 4.36 inches (109 mm.). 

 Skull of type: Occipitonasal length 85; greatest zygomatic breadth 

 55; breadth across postorbital processes 24; palatal length 44; length 

 of audital bullae 19. 



'Type No. 7417, Bangs collection, from Okak, Labrador. 



