PUTORIUS. 345 



Winter Pelage. White, except end of tail which is black. 

 Measurements. Total length, 335: tail vertebra', 95: hind foot, 48. 



506. streatori. [Putorius), Merr., N. Am. Faun., No. 11, 1896, p. 13. 

 yV/c Lnality. Mount Vernon, Skagit Valle\-, Washington. 

 Geogr. Distr. Coast region of Oregon and Washington to Puget 



Sound. 



Genl. Char. Like /'. eieognani, but smaller and darker; white on 

 belly restricted. 



Ci'Ior. Upper parts dark chocolate brown, as are also the upper 

 lip and feet; the head darkest in hue. This color trespasses on under 

 parts leaving a narrow, irregular portion white. 



Measurements. Totallength, 270; tail vertebra', 83; hind foot, 38. 



507. ri.xo^us. [Putorius), Bangs, Proc. Biol. Soc. Wash., 1S96, pp. 



21, 22. 

 pusillus, Baird, N. Am. Manim., 1857, pp. 159, 161. (Part.) 



Type locality. Osier, Saskatchewan, Canada. 



Geogr. Dtstr. Hudson Bay to coast of Alaska; northern Minne- 

 sota to Montana. 



Genl. Char. Smallest of the Weasels, tail without black tip. 



Color. Above dark reddish brown, under parts white. Tail like 

 body. 



Winter Pelage. White. 



Measurements. Total length, 150; tail vertebra'. 31: hind foot, 22. 



a.—esklmo. {Putorius), Stone, Proc. Acad. Nat. Scien., Phil., 1900, 

 p. 44. 



Ty/e locality. Point Barrow, Alaska. 



Geogr. Distr. Northwestern Alaska, limits of range unknown. 



Genl. Char. Size small, larger than P. rixosus, tail shorter; feet 

 larger. 



Color. Brown with a reddish tinge; intermediate between Prout's 

 and walnut brown. 



A/easurements. Totallength, 178-230; tail, 22-31; hind foot, 16- 

 23. Skull: basal length, 29-35; mastoid breadth, 15. 4-17; breadth of 

 postorbital processes, 9.3-1 1; orbital breadth, 8-9; palatal length, 

 12.1-14.4. 



508. arcticus. (Puto/ius), Merr., N. Am. Faun., No. 11, 1896, p. 15. 

 7'y/>e locality. Point Barrow, Alaska. 



Geogr. Distr. Arctic coast and Tundras. 



Genl. Char. Size large, ear small; terminal half of tail black. 

 Skull broad and massive; postorbital constriction considerable; post- 



