SCIURUS. 123 



with basal brownish yellow patches; under parts white; tail above 

 grizzled brownish yellow, washed with white, beneath similar in 

 color, bordered with black and edged with white. 



Measurements. Total length, 524; tail vertebrae, 255; hind foot, 

 62. Skull: basal length, 53; palatal length, 26.3; interorbital width, 

 20; zygomatic width, 34; length of upper molar series, n. ' 



85. truii (Sciurus), Nelson, Proc. Wash. Acad. Scien., i, 1899, p. 61. 

 TRUE'S SQUIRREL. 



Type locality. Camoa, Rio Mayo, State of Sonora, Mexico. 



Geogr. Distr. Southwestern part of the State of Sonora and 

 northern portion of the State of Sinaloa, Mexico. 



Gcnl. Char. Similar to 5. colliai, but back dark yellowish and 

 skull differently proportioned. 



Color. Upper parts grizzled dark yellowish ; sides of head yellowish 

 gray; ears rusty; basal patches same color; outside of arms, legs, 

 hands and feet dark gray; under parts white; tail like back at base, 

 remainder above mixed black and dark yellowish tinged with white; 

 beneath similar, with an ill-defined black border and white edge. 



Measurements Total length, 485; tail vertebras, 254; hind foot, 

 66. Skull: average of four; basal length, 47.7; palatal length, 24.3; 

 interorbital width, 18.3; zygomatic width, 33.2; length of upper 

 molar series, n. 



86. socialis (Sciurus}, Wagn., Abh. Math. Phys. Cl. K. Bayer. Akad. 



Wiss., Miinchen, 11, 1837, pp. 501-7, pi. v. 



aureigaster Allen, Mon. N. Am. Roden., 1877, p. 750. (Part.) 



leucops Allen, Mon. N. Am. Roden., 1877, p. 753. (Part.) 



variegatus Alston, Proc. Zool. Soc., 1878, p. 660. (Part.) 

 TEHUANTEPEC SQUIRREL. 



Type locality. Near Tehauntepec City, State of Oaxaca, Mexico. 



Geogr. Distr. Puerto Angel, State of Oaxaca, south to Tonala 

 and Tuxtla, State of Chiapas, Mexico, below 3,000 feet. 



Genl. Char. Color variable; *nape patch, when present, rusty 

 rufous; under parts from white to ferrugineous. 



Color. Above mixed white and black tinged with yellowish or 

 rufous; nape blackish rusty rufous; rump patch sometimes exhibiting 

 rusty rufous; cheeks, space around eyes, and bases of ears yellowish 

 brown; orbital ring dull fulvous; under parts white; tail like rump 

 all around the base, remainder above black washed with white, 

 beneath from fulvous gray to orange, bordered by black and edged 

 with white ; hands and feet like back. 



* Specimens from near Tonala are usually without nape patch. 



