SCIURUS. 107 



PAGE 



c." Above gray; tail beneath cinnamon. .5. nayarilensis 108 

 d." Above mixed gray, black, white, and 



tawny; tail beneath tawny 5. arizonensis 109 



e." Above grizzled gray ; tail beneath pale 



chestnut 5. a. huachuca 109 



b.' Under parts buffy yellow to orange yellow. . . .5. apache no 



74. oculatus (Sciurus), Peters, Monatsb. K. Preuss. Akad. Wiss. Berl., 

 1863, p. 653. 



capistratus Licht., Abh. K. Akad. Wiss., 1827, p. 116. (nee Bosc.) 



carolinensis Sauss., Rev. Mag. Zool., sme Se"r., xm, 1861, p. 4. 

 (nee Gmel.) 



hypopyrrhus Allen, Bull. U. S. Geol. Surv. Terr., iv, 1878, p. 881. 

 (Part.) 



niger melanonotus Thomas, Proc. Zool. Soc., 1870, p. 73, pi. vi. 

 BLACK-BACKED SQUIRREL. 



Type locality. Las Vigas? State of Vera Cruz, Mexico. 



Geogr. Distr. Northwestward through States of Vera Cruz, 

 Hidalgo, Queretaro to southeastern San Luis Potosi, Mexico. Alti- 

 tude, 6,000-12,000 feet. 



Genl. Char. Size large; skull broad and heavy. 



Color. Upper parts dark gray, with a black band from middle of 

 crown to base of tail; orbital ring whitish; cheeks and sides of neck 

 grizzled gray with a buff tinge, not always, however, present; ears 

 dull gray with white or buff basal patches; hands and feet grizzled 

 gray or buffy; outside of arms and thighs gray, sometimes rusty 

 brownish on the thighs ; under parts white with buffy tinge to ochra- 

 ceous buff; tail above black washed with white, beneath grizzled 

 gray, tinged with yellowish, bordered with black and edged with 

 white. 



Measurements. Total length, 544; tail vertebrae, 254; hind foot, 

 69. Skull: average of three; basilar length, 54.6; palatal length, 

 28.5; interorbital width, 20.3; zygomatic width, 36.3; length of upper 

 molar series, 1 1 . 



a. tolucce (Sciurus), Nelson, Proc. Biol. Soc. Wash., xn, 1898, 



p. 148. 

 TOLUCA SQUIRREL. 



Type locality. North slope of the Volcano of Toluca, State of 

 Mexico, Mexico. 



Geogr. Distr. Sierra Madre from Toluca Volcano, State of 

 Mexico, to border of State of Michoacan; southern and western 

 parts of State of Queretaro; central and eastern parts of State of 

 Guanajuato, and southern part of State of San Luis Potosi, Mexico. 



