SQIJIRRELS OF MEXICO AND CENTRAL AMERICA 5 1 



belly. An immature female from Patzcuaro has the feet gray, but 

 this is rare. Only three of the large series in the gray phase from 

 Patzcuaro have buff underparts. The amount of intermixed rusty on 

 the back varies but is never strong enough to affect the general color. 



Measu7-ements. — Average of five adult specimens from type 

 locality : total length 537 ; tail vertebrae 273 ; hind foot 6"^.%. 



Cranial characters. — Premolars f-. Skulls not distinguishable 

 from those of S. poUopus. Three adult skulls from the type locality 

 average: basal length 51; palatal length 26.8; interorbital breadth 

 18.6; zygomatic breadth 34.3; length of upper molar series 11. 



Habits. — These squirrels feed upon acorns and pine seeds accord- 

 ing to the season, and are not so shy as some of their relatives. They 

 vv^ere common near Patzcuaro and on the Volcano of Toluca. 



Specimeiis cxainined. — Thirty-two : from Patzcuaro and Nahuatzin, 

 Michoacan, and north slope Volcano of Toluca, Mexico. 



SCIURUS POLIOPUS CERVICALIS (Allen). 

 Colima Mountain Squirrel. 



Sciierus leucops Allen, Mon. N. Am. Rodentia, pp. 753-756, 1877 (part : 

 specimens from Sierra Madre of Colima — not ^S". leucops Gray, 1867). 



Sciurus variegatus Ai^syo^, Biol. Cent. -Am., Mammalia, pp. 127-128, 1880 

 (part : specimens from " Durango, Xantus, U. S. Nat. Mus." ; really 

 from the Sierra Madre of Colima. Not S. variegatus Erxl., 1777). 



Sciiirus atireoo;astcr leucops Allen, Bull. Am. Mus. Nat. Hist., N. Y., 11, pp. 

 1 66-1 67,'' Oct., 1889. 



Schirus ccrjncalis Allen, Bull. Am. Mus. Nat. Hist., N. Y., in, pp. 183- 

 185, Dec, 1890, 



Sciuriis wagncri cervicalis Allen, Bull. Am. Mus. Nat. Hist., N. Y., x, p. 

 454, Nov., 1898. 



Type locality. — Hacienda San Marcos, Tonila, Jalisco, Mexico 

 (at east base of Sierra Nevada de Colima). Type no. 1991, 

 American Museum of Natural History, New York. 



Distribution. — Pine and oak forests of Upper Austral and Boreal 

 zones of the Sierra Nevada de Colima, Jalisco, Mexico, and thence 

 north along high mountains to Ameca, Jalisco, and east into western 

 Michoacan (alt. 6000-12,000 feet; sporadically down to 4000 ft.). 



Characters. — Readily distinguished from the other forms of 

 S. poliopus by the dark iron gray upperparts, blackish head, dark nape 

 and rump patches, and dark iron gray under surface of tail. Pelage 

 thick and soft; tail large and full. Teats: p. j- ^- f ^- x- 



Color. — Top of nose and fore crown shiny black with grizzling of 

 grayish white ; nape and rump patches usually distinct, dark fulvous 

 or rusty brown heavily washed and grizzled with black ; rest of upper- 



