﻿14 



NORTH AMERICAN FAUNA. 



[No. 11. 



prominent postorbital processes aud smaller aiidital l>iilla\ Skull of 

 female very iiuieh smaller and more delicate thau that of male^ 

 resembling female of civogiutni, but smaller, 



BcmarL'^. — Futorlus streatori is a dark Pacific Coast form of cicognanij 

 witli Avliicli it may be found to iiitergrade. It ditt'ers consi)icuoUwSly 

 from civognani in the color of the under x^arts, the dark chocolate brown 

 of the back and sides encroaching far on the throat and usually meet- 

 ing along the median line of the belly, thus reducing the white to a 

 narrow and irregular strip, which expands on the anterior x)art of the 

 throat, on the breast behind the fore legs, and immediately in front of 

 the hind legs, and stops abrui)tly on the under surface of the thighs. 



Five winter specimens from Sunms, British Columbia, kindly loaned 

 by Mr. Outram Bangs, point toward intergradation with clcognam. In 

 three out of the five, the toes of both fore and hind feet are white, and 

 the color of the upper parts is much i)aler than in summer i^elage. 

 Two of these specimens have the bellies broadly white, as in eicogriani. 

 They are also much larger than streatori. Specimens from Sicamous, 

 in the interior of British Columbia, are fairly typical cicognanij having 

 the under parts broadly white; the upper lip, a strip along the inner 

 border of the hind feet, and the toes of both fore and hind feet, white. 

 Specimens from southeastern Alaska (Juneau, Wraugel, and Loring) 

 must also be referred to cicognanij and not streatori. 



Measurements. — Unfortunately, no flesh measurements are available 

 from the type locality. Specimens from Trout Lake, near Mount Adams, 

 Washington, are slightly smaller than the Mount Vernon specimens, 

 and measure as follows: Average of two adult males: Total length, 

 270; tail vertebrje, 83; hind foot, 33. An adult female: Total length, 

 210; tail vertebrie, 51; hind foot, 24. 



PUTOEIUS RIXOSUS Bangs. Bang's Weasel. 

 (PI. II, figs. 7, 7a.) 



1857. Putorius pusillus Baird: Mammals N. Am., pp. 159-161, 1857. (In part: speci- 

 men from Pembina. ) 



1896. Futorlus rixosus Bangs: Proc. Biol. Soc. Wash., Vol. X, pj). 21-22, Feb., 1896. 



Ti/2)e locality. — Osier, Saskatchewan, Canada. 



Geographic distribution. — Boreal America from Hudson Bay to coast 

 of Alaska (St. Michaels) ;- south to northern Minnesota (Pembina) and 

 Montana (Sun Eiver). 



General characters. — Smallest Aveasel known; tail short and without 

 black tip ; only American weasel lacking the black tip. 



Color. — Summer pelage: Upper i^arts dark reddish brown; ti}) of tail 

 not darker; under parts white. In icinter pelage: Pure white all over, 

 including end of tail. 



Cranial characters. — Skull (of type specimen, 9 ad., Ko. 642 Bangs' 

 Coll.^) very much smaller than the smallest female of any other known 



1 1 am indebted to Mr. Bangs for tbe privilege of examining this specimen. Unfor- 

 tunately, the basioccijpital is broken oif ; hence the basilar length is estimated. 



