1909] The 1907 Alexander Alaska Expedition. 249 
in coloration with the back; tail like the back and without con- 
spicuously darker terminal band or a dark median stripe infe- 
riorly. Skull with enlarged audital bullae, the surfaces of which 
rise to the level of the raised borders of the basioccipital pro- 
cesses. Walls of infraorbital foramen very heavy, the basal wall 
ending in a blunt process. 
CoLORATION.—Snout anteriorly grayish white, with a small 
blackish area a short distance posterior to snout; grayness of 
snout giving way in the interorbital region to the black oceipital 
area which extends to the ears; ears and sides of head blackish, 
slightly grizzled; nape, shoulders and back blackish, interspersed 
with long white hairs; rump posteriorly with a faint trace of 
brownish; tail blackish with hght brownish tips, the basal por- 
tion walnut brown. Sides of body erizzled like the back; fore 
and hind hmbs like the back. Underparts grayish. 
The series of seven skins from Glacier Bay is extremely vari- 
able in coloration. They are all in various conditions from old 
faded pelage to new, but their diverse coloration is not due to 
this condition. These skins range from the grayish type which 
is sprinkled with white hairs to a specimen which is almost uni- 
form black with the exception of the hoary snout and interor- 
bital region and a few grayish hairs about the sides and along 
the neck and patches on the chin, throat and midline of the belly. 
None of these skins make a close approach to the coloration of 
caligata. They lack any indication of the tricolored dorsal effect 
of black occiput, hoary nape and shoulders, and fulvous or 
tawny rump. The series of caligata from Prince William Sound, 
the Kenai Peninsula and Yakutat are quite uniform in colora- 
tion in all pelages. Further differences as compared with cali- 
gata are the blackish tails with yellowish tipped hairs, these 
parts in caligata being fulvous with black-tipped hairs and a 
distinct black terminal band. In winter pelage caligata shows 
a much heavier black wash which obscures to some extent the 
tricolor dorsal pattern. 
SKULL OF TyPE.—Similar in size and proportions to that of 
caligata. The chief differences are the larger, more rounded 
audital bullae and a shallowness of the basioccipital trough due 
to the lower processes of the basioceipital. The lower wall of 
