170 Preble — A New Weasel from Queen Charlotte Islands. 



requires no comparison with that specie?, being much more stoutly built 

 and angular. Compared with Putorius kadiacensis, which is undoubtedly 

 its nearest relative, the skull of the present species is considerably smaller, 

 with flatter braincase, mandible more deflected, post- palatal notch much 

 smaller, relatively and absolutely. Zygomata very slender throughout, 

 post-molar production of palate longer and narrower, and post-glenoid 

 space longer and more swollen. Bulla? smaller and flatter. Teeth through- 

 out much smaller than in P. kadiacensis. 



Remarks. — By a fortunate coincidence the type of the present species 

 and the type of P. kadiacensis, with which it requires comparison, agree 

 exactly in condition of pelage. Both are also adult males of almost pre- 

 cisely the same age, a circumstance which makes the comparison sim- 

 ple and satisfactory. The fur of P. haidarurn is finer than that of P. 

 kadiacensis. In the latter species the summer fur just appearing is light- 

 brownish in color, thus contrasting quite strongly with the blackish 

 brown of the corresponding portions of P. haidarurn. The terminal por- 

 tion of the tail of P. kadiacensis is considerably suffused with brownish, 

 while in /'. haidarurn- it is pure black. The type of P. kadiacensis meas- 

 ured in the flesh: Total length, 318; tail vertebrae, 86; hind foot, 44; 

 pencil of tail, 40. P. haidarurn measured in flesh: Total length, 275 ; 

 tail vertebra', 60; hind foot, 37; pencil of tail, 40. The black portion of 

 the tail measured about 60 mm. in each case, thus comprising about 60 

 per cent, of the entire length of tlie tail in P. Imidarum and about 50 per 

 cent, in P. kadiacensis. 



The type skull of P. haidarurn measured as follows: Basal length, 38; 

 zygomatic breadth, 22.5; mastoid breadth, 11); breadth across post- 

 orbital processes, 13; interorbital breadth, 10.5; foramen magnum to 

 posterior plane of molars, 25; palatal length, 15.5; post-palatal length, 

 20.5. 



Unfortunately this skull was infested with parasites, and therefore the 

 measurement of the breadth across post-orbital processes may not be ex- 

 actly correct. 



