112 University of California Publications in Zoology. \Vou.s 
of the Rocky Mountains and eastward. I cannot see why the 
existence of this race should be ignored by anyone who has taken 
the pains to compare a reasonable amount of pertinent material. 
Dendroica auduboni auduboni (Townsend). 
Audubon Warbler. 
This was one of the most abundant birds of the San Bernar- 
dino mountains, and was widely distributed from the lower edge 
of the Transition zone up through the Boreal. It was numerous 
and nesting about Dry lake, 9000 feet altitude. On June 18, 
1905, it was seen on the north slopes of San Gorgonio peak 
almost to timber limit, 10,500 feet elevation, at least. It was 
likewise met with commonly among the tamarack and limber 
pines about the summit of San Bernardino peak, July 12. Along 
the upper Santa Ana from the lower limit of the Jeffrey pines, 
about 5500 feet, up into the fir belt, Audubon warblers were 
numerous in June and nesting, but because of the difficulty of 
locating their nests we found only five. A nest was found in 
Fish creek canon June 21, 1905, with half-fledged young. It was 
twenty feet above the ground in the thick foliage of a short 
drooping fir bough. It was compactly composed of weathered 
erasses, frayed-out plant fibres, and tail and wing feathers of 
juncos and other small birds. Internally it was thickly lined 
with mountain quail feathers, some of the chestnut-colored ones 
sticking above the rim conspicuously. This feather feature seems 
to be characteristic of Audubon warblers’ nests, as 1t was notice- 
ably present in all those we saw. Another nest was found June 
10, 1906, on the Santa Ana, near our South Fork camp. This was 
twenty-five feet from the ground on one of the lowest branches 
of a yellow pine. The nest was ensconced within a tuft of needles 
five feet out from the trunk of the tree. This nest was composed 
after the same fashion as the other, and held four considerably 
incubated eggs. <A third nest was found at Dry lake, June 14, 
1906. This was at the end of a drooping tamarack pine branch, 
and held four fresh eggs. 
We were astonished to find one case of the Audubon warbler’s 
nesting low down, almost at the upper edge of Sonoran. This 
