i SCIURUS., 
The Chickarees, or Red Squirrels, comprising the last sub-genus 
of Seturus, are boreal in their range and are found as far north as 
the limit of trees. So far as known, only one subspecies penetrates 
into Mexico, and this is confined to the San Pedro Martir Mountain 
range of Lower -California, where probably by a lofty altitude it 
counteracts the effects of a more southern latitude. The tail of the 
Red Squirrel is smaller than that of the gray squirrel group and its 
allies, and the ears are often tufted or penciled in winter, and the 
species represent in America the common squirrel of Europe. Like 
many species of Tamias, at certain seasons the Chickarees have a 
black line along the side dividing the color of the upper and under 
parts 
[, Tamiasciurus, Chickarees, 
Premolars, | or = Skull short, broad, depressed between 
i] 
orbits; superior outline greatly curved, highest point between post 
orbital process of the frontal; rostrum short, broad; nasals broad, not 
Fia. 21 SCIURUS (TAMIASCIURUS) D. MEARNS 
No, 2s170 U.S, Nat. Mus. Co Na 
