SCIURUS. 125 
or gray washed with fulvous; base of tail like back, rest above 
black washed with white, beneath grizzled yellowish or brownish, 
bordered with black and edged with white. 
Measurements. Total length, 547; tail vertebrxz, 270; hind foot, 
68. Skull: average of four; basal length, 51.8; palatal length, 27.2; 
interorbital width, 19; zygomatic width, 34.4; length of upper molar 
series, I1.4. 
a.—chiapensis (Sciurus), Nelson, Proc. Wash. Acad. Scien., 1, 1899, 
p. 69. 
CHIAPAS SQUIRREL. 
Type locality. San Cristobal, State of Chiapas, Mexico. 
Geogr. Distr. Mountains of central portion of State of Chiapas, 
Mexico. Altitude, 7,500-9,500 feet. 
Genl. Char. Similar to S. griseiflavus, but grayer above, and 
feet whitish. 
Color. Upper parts and outside of arms and legs grizzled gray; 
ears grayish white, with white basal patches; orbital ring pale fulvous; 
sides of head fulvous brown; sides of nose, lower part of cheeks, 
chin and throat, whitish gray; hands and feet grayish white; under 
parts rufous; base of tail all around like back, above black, washed 
with white, beneath yellowish brown or rufous, bordered with black 
and edged with white. 
Measurements. Total length, 506; tail vertebre, 253; hind foot, 
70. Skull: average of five; basal length, 50.9; palatal length, 26.6; 
interorbital width, 19.1; zygomatic width, 34.3; length of upper 
molar series, 11.4. 
88. yucatanensis (Sciurus), Allen, Bull. Am. Mus. Nat. Hist.,1897,p.5. 
carolinensis yucatanensis Allen, Mon. N. Am. Roden., 1877, p. 705. 
carolinensis Alston, Proc. Zo6él. Soc., 1878, p. 658. 
YUCATAN SQUIRREL. 
Type locality. Merida, Yucatan, Mexico. 
Geogr. Distr. Peninsula of Yucatan, Mexico. 
Genl. Char. Pelage coarse, bristly; ear tufts sometimes present. 
Color. Upper parts and flanks grizzled gray and black, some- 
times tinged with yellowish brown; sides of head pale gray; orbital 
ting whitish; outside of arms and legs, with feet and hands, like 
back; ears dark gray; some specimens have whitish basal patches; 
tufts yellowish white, not always present; under parts whitish or 
grayish white; base of tail all around like back, remainder above 
black, washed With white, beneath grizzled gray, with a narrow 
black border and white edge. 
