Gary's Chipmunk 
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and back of hind legs gray ; tail much as in minimus but paler. This 
pelage is retained by the breeding females at least until July ist. 
In summer pelage, as shown by males taken late in June, it is 
similar to E. minimus above, but the rufous of the sides is paler, 
and not quite as extensive, while the flanks, shoulders, and neck 
are much grayer, and the top of the head appears to be somewhat 
darker than that of specimens of minimus taken at the same season. 
Distribution. — In a recent visit to the San Luis Valley I first 
saw this species just south of Moffat, and thence to Mosca it was 
seen more or less frequently. Farther south than Mosca I did not 
go. It was taken at San Luis Lake, and the Medano Ranch, the 
latter place being the type locality. I saw it on the east side of the 
San Luis Valley, between the Durkee Ranch and Mosca Creek, and 
thought I saw it at the latter place in the sandy country bordering 
the foot-hills there. I also saw it near Crestone, Saguache County. 
The limits of its range are not yet know^n. 
Habits. — Gary's Chipmunk was found in the greasewood 
and rabbit-brush of that part of the San Luis Valley visited 
by me. I found it to be a very wild and shy species and very 
difficult to collect by shooting, for they seemed to run at the 
first sight of a person, and dodged in and out amongst the 
brush so that one could hardly get sight of them. Half- 
grown young were taken at Mosca, June i8th, and the females 
seemed to be nursing nearly, if not quite, to July ist. 
Genus SCIURUS (Lat., a squirrel, literally shade-tailed) 
Sciurus Linn,, Syst. Nat., loth ed., p. 63 (1758). Type 5. vulgaris. 
The members of this genus, the true squirrels, are distinguished 
by their long, broad, and bushy tails, their pointed and often tufted 
ears, and their feet which are adapted for climbing, the anterior 
with four digits and a rudimentary pollex, the posterior with five, 
all with claws; postorbital processes well developed; dentition, i. 
{ ; pm. ^ ^ ; m. f X 2 =22; upper anterior upper premolar when 
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present small. 
Squirrels are found throughout the temperate and tropical 
regions of the whole world except in Australia and Madagascar 
and the genus being a very large one has recently been 
