1908] Grinnell —Biota of the San Bernardino Mountains. 141 
species extends high up over the range in some places, was shown 
by our finding it at Cactus Flat, 6000 feet altitude, August 15 
to 17, around Doble, 7000 feet, and at the north end of Baldwin 
lake, 6800 feet. At the latter places adults and small young 
were trapped or shot on the sage flats, August 5 and 6. 
The extremest extension of the range of this desert species 
was shown by its discovery, August 22 to 24, on the sage-covered 
fan at the north base of Sugarloaf, 7500 feet altitude. Here we 
found it to be common though shy and seldom seen among the 
close-set bushes. Our traps, however, showed its abundance; for 
instance, August 22, out of a line of thirty day-time traps set 
across the sage slope, eight were sprung and three “‘Ammos”’ 
secured. I first became aware of their presence through the 
characteristic note, which may be unsatisfactorily described as 
a weakish trill with descending inflection. 
Seventeen examples of this species were preserved. They 
seem to be precisely like others from Palm Springs on the Colo- 
‘ado desert. 
Callospermophilus bernardinus (Merriam). 
San Bernardino Spermophile. 
This yellow-headed, short-tailed, terrestrial squirrel is a char- 
acteristic and abundant. species in the higher San Bernardino 
mountains. We found it most numerous in the upper Transition 
zone and above, though in Bear valley it ranged down almost to 
the lower edge of Transition, 6700 feet altitude. South of the 
Santa Ana we found none below an elevation of 8000 feet alti- 
tude, and the belt of greatest abundance was that wherein the 
chinquapin was the prevailing brush plant, 8500 to 9500 feet 
altitude. At the head of the south fork of the Santa Ana and 
around Dry lake we shot and trapped a great many in June. Up 
to this date only adults in very pale and worn pelage came to our 
notice. I saw several on the upper slopes of San Gorgonio peak 
among the gnarled and prostrate limber pines and rock slides; 
and on June 19, 1907, I got a good view of one among some rocks 
within a hundred yards of the monument on the very summit of 
the peak, 11,485 feet altitude. This species thus ranged highest 
of any of the mammals we found in the region. (See pls. 88, 17.) 
