1903.] Allen, Mammals from Northern British Columbia. 5^3 



The five males measure as follows: Total length, 330.5 

 (302-348); tail vertebras, 99.5 (94-108); hind foot, 43.5 (41- 

 46); ear, 20.5 (20-21.5). The two females measure respec- 

 tively: Total length, 265, 250; tail vertebras, 80, 70; hind 

 foot, 34.5, 32; ear, 16, 16. 



Four of the specimens are almost pure white below and the 

 other three show a decided tinge of yellow. 



37. Putorius microtis, sp. nov. SMALL-EARED WEASEL. 

 Type, No. 19964, 3 ad., Shesley, September 24; M. P. Anderson. 



Similar in coloration, including the white on the feet, to Putorius c. 

 richardsoni , but very much smaller, with very small ears and very 

 pronounced cranial characters. 



Above dark brown, with a slight tinge of golden, but not very de- 

 cidedly different from yellowish-brown specimens of richardsoni; below 

 white, with a strong tinge of sulphur yellow; extent of white on the 

 toes of both fore and hind feet about as in average specimens of 

 richardsoni. Ears very small, 2 mm. less in height, and in general size 

 one-half less than in richardsoni. 



Skull. Rostral and interorbital portions of the skull very broad, 

 the nasals broader than in the much larger richardsoni; zygomata, 

 weak, uniformly curved outwardly; postpalatal fossa small, narrow 

 U-shaped; audital bullae small, flat, very little inflated in comparison 

 with richardsoni, the small development of the bullae coordinated with 

 the small external ear. 



Measurements. Total length, 295; tail vertebras, 82; hind foot, 

 37; ear from crown, 19 mm. Skull: Total length, 40; zygomatic 

 breadth, 20.5; length of nasals, 7; width of nasals at middle, 3.5; 

 length of palate, 14; interorbital breadth, 9; postorbital breadth, 

 9.5; breadth across postorbital processes, u; mastoid breadth, 14; 

 breadth of skull across audital bullae, 19; length of audital bullas, 12; 

 width of bullae, 7; height of bullae above postpalatal floor, 1.6; length 

 of premolar-molar series, 9; length of lower jaw, 20; height at coro- 

 noid process, 9. The size of the skull is intermediate between that of 

 male and female skulls of richardsoni, male skulls of richardsoni of 

 exactly corresponding age having a length of 45 mm. as against 40 

 in the present species and 35 in the female of richardsoni. 



Represented by a single adult male taken at Shesley, 

 British Columbia, September 24. 



While similar in coloration to Putorius richardsoni, it is 



