1908] Grinnell—Biota of the San Bernardino Mountains. 117 
The same date in 1906 the first was taken on the upper Santa Ana 
near our South Fork camp. The species was observed on Sugar- 
loaf August 19, 1905, where it was common among the tamarack 
pines on the very summit in mixed companies of other warblers. 
It was also numerous August 20 to 23 in the willow thickets at 
the north base of Sugarloaf. Around Bluff lake August 28 to 
September 3, the species was still more plentiful. 
Cinclus mexicanus unicolor (Bonaparte). American Dipper. 
Dippers were seen only on the head waters of the Santa Ana, 
where four examples were taken. A family of full-grown young 
were seen near the head of the South Fork, 8500 feet altitude, 
June 29, 1905. June 19, 1907, a family of young with their 
parents were followed along the ravine, then containing a con- 
siderable stream, which leads down from Dry lake and carries 
its overflow. This was near 9000 feet altitude, the highest we 
saw the species in the region. The habit shown by this bird of 
assuming a motionless, statuesque, attitude on a rock renders it 
easily overlooked until one happens to approach close enough to 
scare it into movement, when it flies rapidly off with sharp cluck- 
ing notes. 
Mimus polyglottos leucopterus (Vigors). Mockingbird. 
Mockingbirds were seen at Cushenbury springs, 4000 feet al- 
titude, which is in the Lower Sonoran zone at the desert base of 
the mountains. Not over three individuals were seen, of which 
one, a full-grown juvenal, was taken August 12, 1905. The 
species was also noted at the Pacific base of the mountains, near 
the mouth of the Santa Ana, June 11. 
Toxostoma redivivum pasadense (Grinnell). 
Pasadena Thrasher. 
Several Pasadena thrashers were noted along the road through 
the scrub oak belt between Bear creek and Clarke’s ranch, 3500 
. to 4500 feet altitude, June 12, 1905. And on August 5, 1907, I 
saw a pair and heard others in the brush belt on the north wall 
of the upper Santa Ana, at 5500 feet altitude. These were the 
