1908] Grinnell—Biota of the San Bernardino Mountains. 95 
Spizella atrogularis (Cabanis). Black-chinned Sparrow. 
The characteristic song of the black-chinned sparrow was 
heard at suitable places along the walls of the lower Santa Ana 
cafion June 11 and 12, 1905. On the brushy south-facing moun- 
tain side between Clarke’s ranch and Seven Oaks, 4500 to 5000 
feet elevation, the species was numerous June 13, and some time 
was spent in searching for nests, but without success. The birds 
were again seen on the road above Clarke’s ranch on September 
4, when specimens in full winter plumage were taken. They 
were also frequently seen and heard in June and July along the 
north side of the upper Santa Ana, as far as the south face of 
Sugarloaf, about 6800 feet altitude. Several were heard and seen 
in the wash at the mouth of Mill creek, June 13, 1907. The only 
other place that we found them was at Cactus Flat, 6000 feet. 
altitude, where on the desert slope of the mountains, at various 
times between August 9 and 17, many were seen and several 
taken on the brushy mountain side. Both adults and birds-of- 
the-year were secured and all had nearly or quite completed the 
fall moult even as early as August 9. Adults as well as young 
in the winter plumage lack entirely the black chin patch. Nine 
examples were taken. 
Junco hyemalis thurberi Anthony. Sierra Junco. 
Sierra juncos occurred in more or less abundance throughout 
the Transition and Boreal zones. They favored the margins of 
cienagas and stream banks, in preference to the dry open woods, 
especially as breeding places. They were excessively numerous 
among the cienagas at the head of the South Fork of the Santa 
Ana, and at Bluff lake. They were fairly common in the breed- 
ing season along the upper part of Mountain Home creek, and 
along the upper Santa Ana from Seven Oaks to the heads of the 
tributary streams. At least twenty-five nests were found, con- 
taining eges or young. The nest complement was usually four, 
though quite frequently only three. Nearly fledged young were 
noted as early as June 15 (1907), so that nesting must begin early 
in May. Fresh eggs were found from June 11 to 28; and at 
Bluff lake, July 27, 1905, a female junco was flushed from her 
