70 University of California Publications in Zoology. [Vou-5 
loosely put together. There were three eggs in plain view and it 
seemed as though there would be room for two more out of sight. 
One egg was finally secured by the aid of a tin teaspoon and a 
long piece of telephone wire; but the operation resulted in badly 
denting the egg. It was pure white and was fresh at this date, 
June 12. This nest crevice was about twenty feet above the 
stream-bed in a wall of broken granite slabs. There were doubt- 
less other nests near by, but probably fully as inaccessible. 
White-throated swifts were seen elsewhere in the San Ber- 
nardino mountains always flying overhead. I saw a pair on June 
18, 1905, over the summit of San Gorgonio peak, 11,500 feet al- 
titude. They were also seen on Fish creek, Mill creek, and at 
Bluff lake. At Cushenbury springs on August 14, 1905, several 
of these swifts were seen. One taken was in perfect newly ac- 
quired plumage. Five skins in all were secured. 
Trochilus alexandri Bourcier & Mulsant. 
Black-chinned Hummingbird. 
This hummingbird was common in June in the lower foothill 
canons on the Pacific side of the mountains. It was nesting in 
the lower Santa Ana canon at least as far up as the Narrows, and 
along Mill creek up to the mouth of Mountain Home ereek. At 
the latter point a nest was seen June 9, 1906, on an alder bough 
overhanging the stream within a few feet of the dining-room at 
THarvey’s. 
The black-chinned hummingbird was thus an upper Sonoran 
species, as it was not observed higher in the mountains until the 
last of July, when the general scatter-movement begins. At Bluff 
lake, 7500 feet altitude, a juvenal was taken July 23, 1905. On 
the upper Santa Ana, near the mouth of the south fork, an adult 
male was taken July 31, 1906; and others were seen near our 
Cedar Cabin camp during August. At Cushenbury springs, on 
the desert side of the mountains, the species was identified August 
11, 1905; and it was common at Cactus Flat, August 15 to 17, 
where young males in process of moult were secured. Several 
were noted at the north base of Sugarloaf, August 20. Nine 
specimens of this hummingbird were secured. 
