54 NELSON 



poliopus and, with the exception of ^. p. effugius^ the nape and rump 

 l^atches are more strongly contrasted with the rest of the back. 



Specimens examined. — Ten: from Hacienda Magdalena, Armeria, 

 and Rio Coahuyana, Colima. 



SCIURUS POLIOPUS EFFUGIUS Nelson. Guerrero Squirrel. 



Sciiirns albipcs cffugius'^^i^^o^, Proc. Biol. Soc. Washington, xii, pp. 152- 



153, June 3, 1898. 

 Sciurus wagneri effugius Allen, Bull. Am. Mus. Nat. Hist., N. Y., .x, p. 



454, Nov. 10, 1898. 



Type locality. — High mountains west of Chilpancingo, Guerrero, 

 Mexico. Type no. 70288 U. S. National Museum, Biological Sur- 

 vey Collection. 



Distribution — Pine and oak forests of Transition and Boreal zones 

 along summit of Cordillera in southwestern Guerrero (alt. 7500- 

 9500 ft.). 



Characters. — Back grizzled gray ; nape patch conspicuous, dark 

 rufous ; ear patches large, white and more conspicuous than in any 

 other form of the species ; underparts darker rufous than in poliopus ; 

 median area on under side of tail deeper, richer rufous. Pelage thick 

 and soft ; tail large and bushy. Teats : p. i a. |- i. i. 



Color. — Winter pelage : Nape patch rusty rufous, becoming almost 

 rusty chestnut in some specimens ; top of nose iron gray intermixed 

 with yellow ringed hairs ; rest of dorsal surface finely grizzled iron 

 gray intermixed with rusty ringed hairs ; indications of a rump patch 

 similar in color to nape sometimes present but heavily overlaid with 

 grizzling of white and black ; extension of nape patch over sides of 

 head, including bases of ears and eyes, slightly paler than main area ; 

 ring around eye buffy or whitish ; ears reddish brown like crown, but 

 sometimes grizzled with grayish ; basal ear patches very large and 

 brilliantly white ; outside of legs gray, usually with less mixture of rusty 

 than on back; feet white, often washed with pale rufous; tail at base 

 like rump ; rest of tail above black, heavily washed with white (with 

 rufous under color showing through) ; below, with broad median area 

 nearly pure i-ich dark rufous, narrow black border, and thin white 

 edge ; chin and throat white ; rest of underparts rich dark rufous. Hairs 

 on back black, with short white tips and either basal, sub-basal, or 

 median rings of rufous. 



Variation. — One topotype has the nape patch extending over 

 shoulders and costal region, rest of back strongly suffused with rusty, 

 and a wash of same color on outside of fore legs and feet; another. 



