1908] Grinnell—Biota of the San Bernardino Mountains. 69 
was taken at the north base of Sugarloaf, 7500 feet, August 20. 
Nighthawks were seen flying over Doble early in August, which 
were thought to have been this species. 
The Texas nighthawk is a characteristic breeding bird of the 
Lower Sonoran zone, but like several other species of the same 
zone wanders up even into Transition during the late summer. 
Cypseloides niger borealis (Kennerly). Black Swift. 
On the afternoon of July 16, 1906, I saw two black swifts 
flying down the Santa Ana, over our South Fork camp. There 
was a brisk up-the-canon wind at the time, and the birds beat 
back and forth against it, advancing rather slowly. Their large 
size, and uniformly black color, glancing silvery in certain posi- 
tions of the wings, made identification unmistakable. The next 
day one of these, or possibly another bird, was plainly seen sim- 
ilarly beating down the valley. 
Under precisely similar conditions in 1907, I saw three black 
swifts in the same locality, July 5. And on July 7 I saw pos- 
sibly the same three fly past the cienaga on the south face of 
Sugarloaf, 6700 feet altitude. 
Aéronautes melanoleucus (Baird). White-throated Swift. 
The white-throated swift was abundant along the lower Santa 
Ana canon June 11 and 12, 1905, and many colonies were nesting 
in the precipitous rocky sides of the cahon. Birds were frequent- 
ly seen to enter crevices. Most of these were inaccessible; but 
one nest was discovered by Joseph Dixon though the eges could 
not be secured. The nest was in a crack about two inches wide 
at the outlet but narrowing back inside to only about 114 inches 
near the nest, except at the bottom of the crevice which was 
weathered considerably wider, forming a small cavity. The nest 
was placed on the floor of the cavity and rested on the gravel 
which composed the bottom. The nest was about three feet from 
the outer face of the rock. It could not be seen until one had 
shaded his eyes for a minute or two so as to become accustomed 
to the dim light. The nest was a shallow saucer, we judged about 
four inches across. It was composed of a soft felt-like substance 
