New Squirrels from Mexico and Central America. 155 



This overlies and obscures the nape and rump patches ; the feet also are 

 grayer. The under surface varies from grizzled gray to gray washed with 

 dull rufous, and in two summer specimens from Las Vigas is dingy fer 

 ruginous In the series of 25 specimens from Jico and Jalapa only two are 

 distinctly gray below and three are dingy reddish, washed with grayish. 

 All of the others are intense ferruginous, which in some specimens ex 

 tends up on sides, behind the forelegs, almost as in true aureogaster. The 

 nape and rump patches, while averaging less uniformly distinct than in 

 Las Vigas specimens, are almost invariably strongly marked and separate 

 these specimens from true aureogaster. There is a tendency for the gray 

 to extend over the nape and rump and so obscure these patches. The 

 base and upper part of the tail is as in Las Vigas specimens ; below the 

 black lateral bands are broader and often reduce the rufous central stripe 

 to a narrow streak on basal half. The rufous on tail is deeper than in 

 Las Vigas specimens, varying from deep orange rufous to ferruginous. 

 These specimens are intergrades between frumentor and true aureogaster, 

 but the presence of distinct rump patches places them nearest frumentor. 

 No melanistic phase is known. 



Sciurus socialis cocos subsp. nov. Acapulco Squirrel. 



Type from Acapulco, Guerrero, Mexico. No. 70644, tf ad. , U. S. Nat. 

 Mus., Biological Survey Coll. Collected Jan. 11, 1895, by E. W. Nelson 

 and E. A. Goldman. Orig. No. 7360. 



Distribution. Pacific Coast district of Guerrero and adjacent part of 

 Oaxaca (from Acapulco to Jamiltepec), Mexico. 



Characters. Distinguished from all Mexican squirrels by the sharp con 

 trast between the bright rufous patches on nape and rump and the un 

 usually pale or whitish color on rest of dorsal surface. 2 upper premolars. 



Color. Upper parts from nose to base of tail, except feet and patches 

 on nape and rump, grizzled grayish-white, sometimes with slight mixture 

 of rufous ; darkest on nose and fore part of crown ; on back and flanks, 

 between the nape and rump patches, often almost white, contrasting 

 strikingly with sharply defined patches on nape and rump, which vary 

 from dark almost chestnut-rufous to deep orange-buffy, washed lightly 

 with black. Eyes surrounded by dull fulvous ring in the middle of a 

 fulvous or reddish-brown area which extends back on sides of head to 

 ears and joins rufous nuchal patch on crown just in front of ears. Ears 

 like nuchal patch, with a small patch of rufous or buffy fur behind base. 

 Sides of nose and lower parts of cheeks grayish-white, this color often 

 extending up to lower border of ears and back along sides of neck. Tops 

 of feet white or pale gray ish- white ; chin white ; rest of lower parts vary 

 ing from white to pale creamy-buffy or rich buffy-rufous. Base of tail 

 above like rump patch ; below with anal region like middle of back ; rest 

 of tail on upper surface black, heavily washed with white with the rufous 

 or orange-red under color showing through ; below the median band 

 varies from deep rufous to orange-rufous with a narrow black border 

 edged externally and often more or less overlaid with white ; sometimes 



