1908] Grinnell—Biota of the San Bernardino Mountains. — 125 
downy plant fibers, and contained six newly-hateched young. 
Another nest was found June 21 on a ridge near Dry lake. This 
was twenty feet from the ground in a dead fir stub, and was 
ensconced behind the loosened bark. It consisted of fur, ap- 
parently from the woodrat and chipmunk, and contained five 
eges in which ineubation was well advanced. Another nest con- 
taining seven young was found the same day in a eavity of a pine 
stub even with the surface of the ground. <A fourth nest in the 
same loeality contained six small young. In this ease the nest 
was a felted mass of deer hair and woodrat fur, intermingled 
with a few feathers. It was in a knot-hole of a dead fir sapling, 
two and one-half feet from the ground. In 1906, at Dry lake, 
June 15, a set of five slightly incubated eges of this species was 
taken from an old sapsucker hole twenty feet above the ground 
in a dead tamarack pine. The nest was a large mass of reddish 
deer hair. All of the eges of the mountain chickadee I saw up 
to that time were white, distinctly, though not densely, dotted 
with pale tints of hazel; but in 1907 I found a set of seven fresh 
egos absolutely unmarked, as white as bushtits’ eggs. The nest 
was four feet above the ground in a rotted-out knot-hole of a 
tamarack pine and consisted of a rather seanty accumulation 
of fur and down-feathers. This was at about 9200 feet elevation, 
towards San Gorgonio peak from Dry lake; and there were at 
the time (June 18) numerous deep snowbanks among the trees 
of the seattering forest. 
Chickadees were noted through the tamarack pine belt as high 
as 10,000 feet altitude on the slopes of San Gorgonio peak, and 
on San Bernardino peak to the summit, 10,600 feet. We found 
the species common at Bluff lake, around Bear lake and to the 
summit of Sugarloaf. It was common in August in the pifons 
and chaparral around Doble and Gold mountain, and as far down 
the desert slope as Cactus Flat, 6000 feet elevation. 
The series of twenty-five skins of this species secured present 
certain slight differences from northern California specimens in 
that the general size is greater, the bill especially being larger, 
and the colors more leaden dorsally and along the sides. Hence 
they agree with the race baileyae described by me in The Condor, 
Vol. X, Jan., 1908, D. 29. 
