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 vertebra?, 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, 11.4. 



a. chiapensis (Sciurus}, Nelson, Proc. Wash. Acad. Scien., i, 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 5. 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 vertebrae, 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. Zool. Soc., 1878^. 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 

 ring 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. 



