Mammals of the Mexican boundary. 



2H5 



140; length of hind foot, 80; ear from c•^o^vn, 28. Cok)r gray above, 

 very faintly suffused with yellowish brown on tlie l)aciv. Tail gray 

 above, the hairs very broadly annulated with black and tipped with 

 white; tail below, tricolor, grayish mesially, then broadly banded 

 with black and edged with white. Feet (fig. 41) mixed yellowish 

 brown, gray, and black, the latter predominating on the toes. Ears 

 scantily coated with grayish hair, the color changing to tawniy ochra- 

 ceous at base externally. Cheeks gray, mixed with white. Under 

 parts, inner side of limbs, and orbital circle white. Mammse: P. 

 1,A. I, I. i=4pairs. 



Cranial and dental characters. — The skull (fig. 42) averages 68 by 

 39 mm. in its greatest diameters. It is relatively long and high, 

 though somewhat flattened in the frontal region. Nasals convex and 

 prominent anteriorly, giving in- 

 creased height to the rostrum. 

 First upper premoler small. Inci- 

 sive foraman short. Intertery- 

 goid fossa short, but relatively 

 longer than in iScit/rvs aherfi, 

 measuring (from base of ptery- 

 goid) more than three upper true 

 molars taken together. 



RcTnarhs. — The description of 

 the two recognized subspecies of 

 Sciurus griseus were foreshad- 

 owed by the w^ritings of Dr. J. A. 

 Allen, in the Monographs of 

 North American Rodentia, pub- 

 lished in 1877, wdiei'^i he observes 

 (p. 731): "This species is re- 

 markable for the constancy of its 

 coloration. Among some thirty specimens before me only two 

 depart much from the normal phase, as above described. One 

 is No. 24G3, from near San Francisco, which is faintly washed 

 above with pale reddish brown. The other is No. 3633, from Fort 

 Tejon," etc. Both of these specimens are still in the IT. S. National 

 Museum collection. The first (No. 2463) is a typical specimen of 

 Mr. Bryant's Sciurus griseus nigripes,'^ and the second (No. 3633) is 



o Proceedings of the California Academy of Sciences, second series, II, ISSO, 

 p. 25. The description reads as follows : " During the fall of 1S88 I examined 

 about twenty specimens of this new variety in the flesh from San Mateo County 

 and about the same number of aS'. fossor from the foothills of the Sierra 

 Nevada, as they were offered on sale in the markets. There is no trouble to 

 recognize at a glance the differences which are so strongly marked in the 

 gray squirrels of the Sierra region and those of the redwood coast region 

 south <if Snn Francisco. Subsp. char. — General col(»r of upper parts nnich 



Fig. 41. — Sciurus griseus anthonyi. Laguna 

 Mountains, California. (Cat. No. 61638, 

 U.S.N.M.) a, Forefoot; b, hindfoot. 



