124 SCIURUS. 
Measurements. Total length, 540; tail vertebrz, 280; hind foot, 
65. Skull: average of five; basal length, 51.8; palatal length, 26.9; 
interorbital width, 18.1; zygomatic width, 33.9; length of upper 
molar series, I1.3. 
a.—cocos (Sciurus), Nelson, Proc. Biol. Soc. Wash., x11, 1898, 
Pp. 155: 
aureogaster! I. Geoff., Voy. Vénus, Zool., Atlas, 1846, pl. 10. (nec 
Cuv.) 
ACAPULCO SQUIRREL. 
Type locality. Acapulco, State of Guerrero, Mexico. 
Geogr. Distr. From Acapulco, State of Guerrero to Jamiltepec, 
State of Oaxaca, Mexico, below 1,500 feet. 
Genl. Char. Nape and rump patches distinct; under parts 
variable, white to ferrugineous. | 
Color. Back, outside of arms, legs, hands, and feet grayish or 
creamy white; nape and rump blackish rufous or chestnut; sides of 
head and base of ears and around eyes yellowish; under parts white 
to dark ferrugineous, varying among individuals; ears rufous; tail 
above black washed with white, sometimes tinged with rufous, 
beneath reddish buff to dark ferrugineous, bordered with black and 
edged with white. 
Measurements. Total length, 520; tail vertebra, 261; hind foot, 
68. Skull: average of five; basal length, 50.8; palatal length, 26.5; 
interorbital width, 19.3; zygomatic width, 33.7; length of upper 
molar series, 10.6. 
87. griseiflavus (Macroxus), Gray, Ann. Mag. Nat. Hist., 3d Ser., 
KX, POOF sD. 427. 
ludovicianus Tomes, Proc. Zodl. Soc., 1861, p. 281. (nec. Cus- 
tis.) 
aureigaster Allen, Mon. N. Am. Roden., 1877, p. 750. (Part.) 
affinis Alston, Proc. Zodél. Soc., 1878, p. 660. 
GUATEMALA SQUIRREL. 
Type locality. Guatemala. 
Geogr. Distr. Southeastern part of State of Chiapas, Mexico, into 
Guatemala, 7,000—10,000 feet altitude. 
Genl. Char. Size large; color variable, usually grizzled yellowish 
brown and gray. 
Color. Upper parts grizzled yellowish brown, occasionally washed 
with white, this most conspicuous in winter specimens; outside of 
arms, legs, and flanks like back; hands and feet grizzled yellow or 
yellowish brown; sides of head and ears gray, the latter with grayish 
basal patches; chin and throat grayish fulvous; under parts rufous 
