June 9 BANGS — THREE NEW WEASELS 55 
1899 
audital bullz longer and flatter. The same sexual difference in size and char- 
acters as seen in 2. xoveboracensis. 
Measurements.— Seven specimens from type locality measure as follows (in 
millimeters). 
No. Sex and Age Total length Tail vertebre Hind foot 
g102 & old adult 454- Te 54. 
QI 42 S old adult 465. 168. 50. 
OITS & adult 440. 161. 47-5 
9143 & adult 424. 146. 49. 
Ql44 & young adult 381. 142. 43. 
QIOI 2 old adult 346. 116. 30. 
9122 Q young adult 318. IIo. 35-5 
Skull—Type, @, old adult: basal length, 46.8; occipitonasal length, 48.; 
zygomatic width, 29.; mastoid width, 25.; interorbital width, 11.6; width 
across postorbital processes, 15.; least width behind postorbital processes, to. ; 
length of palate, to end of pterygoid process, 27.8, to palatal notch, 20.8; 
length from palatal notch to foramen magnum, 25.4; width across incisors, 
alveoli, 10.2; greatest length of audital bulla, 15.6; length of single half of 
mandible, 29.4 mm. 
Old adult, 2, topotype, no. gtor: basal length, 39.; occipitonasal length, 
40.8; zygomatic width, 21.8; mastoid width, 19.2; interorbital width, 9.; 
width across postorbital processes, 12.2; least width behind postorbital pro- 
cesses, 9.8; length of palate, to end of pterygoid process, 22.6; to palatal 
notch, 16.; length from palatal notch to foramen magnum, 21.6; width across 
incisors, alveoli, 7.8; greatest length of audital bulla, 14.; length of single half 
of mandible, 22.6 mm. 
Remarks. — Iam still in doubt whether /. occ’sor is a distinct 
species or a highly differentiated northern race of P. noveboracensis. 
Summer specimens may show color differences; but with only 
white winter specimens one must rely wholly upon cranial charac- 
ters and differences in proportions, and I must confess that some 
youngish examples are troublesome, and in one or two cases I am 
in doubt whether to place the specimen with P. occ’sor or with P. 
noveboracensis. There is, however, no trouble in telling the large, 
adult examples —the immensely long, narrow tail of ?. occ?sor, with 
its short black end, the large size of the animal, and the cranial 
characters pointed out above, distinguishing it at once from P?. 
noveboracensis. The largest males of /”. occzsvr are equal in size to 
P. longicauda, and sometimes even exceed that species in length 
of tail. The female, however, is much smaller than the female of 
