MAMMALS OF Till: MEXICAN BOUNDARY. 



2(55 



140; Length oi hind foot, 80; eai from crown, 28. Color gray above, 

 very faintly suffused with yellowish brown on the back. Tail gray 

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

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

 with black and edged with white. Feet ( lio-. II) mixed yellowish 

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

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

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

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

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



Cranial and denial characters. — The skull (fig. \'l) averages 68 by 

 :'»'.• 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 Sciurus aherti, 

 measuring (from base of ptery- 

 goid) more than three upper true 

 molars taken together. 



Remarks. — The description of 

 the two recognized subspecies of 

 Sciurus griseus were foreshad- 

 owed by the writings of Dr. J. A. 

 Allen, in the Monographs of 

 Xorth American Rodentia, pub- 

 lished in 1877. where 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 Xo. 2463, 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 -till in the U. S. National 

 Museum collection. The first (No. -2Mv.\) is a typical specimen of 

 Mr. Bryant's Sciurus griseus iii<iii/><s:' and the second (No. :)i\:\:)) is 



a Proceedings <>f the California Academy of Sciences, second scries. II. 1889, 

 p. 25. The description reads as follows: "During the fall of 1888 I examined 

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

 .'ind aboul the same number of 8. fossor from the foothills of the Sierrsi 

 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 of San Francisco. Subsp. char.— General color of upper parts much 



Fig. 41. — Sciurus griseus anthonyi. Laguna 

 Mot ntains, California. (Cat. No. 

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



