356 THE QUADRUPEDS OF ARIZONA. 
same day, in some of which they were fully developed, 
and in others wanting. They may possibly be a sexual 
distinction. Their absence is the main diagnostic point 
of a S. castanonotus, described by Professor Baird,—a 
supposed species most probably identical with S. Abertiz, 
as that eminent naturalist himself now believes. 
The pine-clad mountains of northern and central Ari- 
zona are the chosen home of this Squirrel; and it rarely, 
if ever, quits these woods for other situations. It is there 
a resident species, breeding in abundance, and braving 
the rigors of winter. Its food is chiefly pine and other 
seeds, particularly pinoñes, the fruit of Pinus edulis, to- 
gether with acorns’ of the several species of oaks which 
grow plentifully in the openings among the pine forests. 
Considering how seldom it is molested in those wild re- 
gions, it is a shy and wary species, and when it discovers 
an intruder, leaps with great celerity to the top of the 
pines, whose size and dense foliage in a great measure 
screen and protect it. It is also a very vigorous and 
muscular animal, requiring to be “hard hit” before it can 
be dislodged from its stronghold. Even when mortally 
wounded, it clings with surprising pertinacity, and for a 
long time, to its perch. Its cries are’ much like those of 
a Fox Squirrel. If wounded and captured, it shows de- 
termined, fight, and can inflict a severe wound if incau- 
tiously handled. 
Near the eastern limit of the Territory I one day ob- 
served a small squirrel, about the size of our chickaree, 
running among some rocks and bushes. Unluckily I 
failed to secure the specimen; but have little doubt that 
it was the rare and slightly known S. Fremontii Aud. 
and Bach. If this idéntification be correct, the locality 18 
the southernmost as yet on record for the species. 
