20 SCIURUS. 



with black; outer side of hind legs light ochraceous-buff ; underparts 

 and inner side of limbs ochraceous-rufous ; (some specimens have 

 white axillae, pectoral and inguinal regions and on the center of abdo- 

 men) ; tail above blackish on basal fourth, then ochraceous-rufous with 

 the tip black, beneath buff and black with a black submarginal stripe 

 edged with ochraceous-rufous; hands and feet mixed blackish and buff; 

 ears blackish. Ex type in United States National Museum. 



Measurements. Total length, 444; tail, 209; hind foot, 61. Skull: 

 Hensel, 41.1; zygomatic width, 22.7; intertcmporal width, 18; length 

 of nasals, 18.8; palatal length, 29.7; length of upper molar series, 9.8; 

 length of mandible, 27.6. Ex type in United States National Museum. 



Subgenus G. Echinosciurus. 



Sciurus poliopus tepicanus Allen. 



Sciurus poliopus tepicanus Allen, Bull. Am. Mus. Nat. Hist., 

 XXII, 1906, p. 243. 



Type locality. Rancho Palo Amarillo, near Amatlan de Canas, 

 Tepic, Mexico. Altitude, 5,000 feet. 



Color. Head in front of ears to end of nose black with white dots 

 intermixed; rest of crown and nape mixed warm buff and black; 

 upperpart and middle of back and outer side of limbs grizzled gray; 

 lower back and rump warm buff like nape; underparts and inner side 

 of limbs white; tail above and below with the hairs ringed black and 

 white, but with less black showing on the under than on the upper part; 

 hands and feet white ; a white patch behind ears. Ex type in Ameri- 

 can Museum of Natural History, New York. 



Measurements. Total length, 600; tail, 300; hind foot, 60. 

 Skull: Total length, 58.8; Hensel, 45.1; zygomatic width, 34.6; inter- 

 temporal width, 18; length of nasals, 16.6; length of upper molar 

 series, 11.4; length of mandible, 30.2; length of lower molar series. 

 ii. 2. Ex type in American Museum of Natural History. 



Sciurus socialis littoralis Nelson. 



Sciurus socialis littoralis Nels., Proc. Biol. Soc. Wash., XX, 1907, 

 p. 87. 



Type locality. Puerto Angel, Oaxaca, Mexico. 



Geogr. Dist. Coastal hills of southern Oaxaca near Puerto Angel. 



Genl. Char. Similar to but paler than 5. socialis. 



Color. Uppcrparts iron-gray like S. socialis but more whitish; 

 nape-patch dark rufous; under] >art and inner side of legs dark rufous; 

 a patch of whitish behind base of ears; top of lu-ad i; on-gray, around 

 eyes dark rufous; checks whitish; tail, median part on both upper and 



