BREWSTER: BIRDS OF THE CAPE REGION, LOWER CALIFORNIA. 183 
Dendroica auduboni Bryant, Proc. Calif. Acad. Sci., 2d ser., II. 1889, 309 (Victoria 
Mts.; Cape Region). 
Young females of this species in autumn plumage not infrequently lack all 
traces of yellow on the throat. In this condition, which is represented by 
several birds in Mr. Frazar’s collection, they are not easily distinguishable 
from the young of coronata, although their upper parts are usually somewhat 
more ashy in tone, and their wings and tails longer. Even in these respects 
the two species occasionally resemble one another so closely as to render their 
discrimination a matter of no slight difficulty. 
Audubon’s Warbler appears to find only a winter home in the Cape Region, 
which it reaches rather late in autumn, judging by the experience of Mr. Frazar 
who first observed it at that season on November 9 at San José del Cabo. 
Later he found it common and universally distributed over the entire country, 
not less abundantly, indeed, on the summit of the Sierra de la Laguna than 
throughout the lowlands bordering the coast. At La Paz the last stragglers 
left for the north before the end of the first week of March. 
Mr. Bryant records Audubon’s Warbler from several places in the upper 
portions of the Peninsula, and Mr. Anthony reports that it is ‘‘ very abundant 
during migrations ” about San Pedro Martir, where, however, it is not known 
to breed, even on the summit of the elevated plateau.) It is resident in 
California, breeding in the mountains as far south as San Bernardino county, 
and also ranging in summer into British Columbia, but not, apparently, to 
Alaska, where it is replaced by D. coronata. Its southward migration extends 
to Guatemala. 
Dendroica nigrescens (Towns.). 
BLACK-THROATED GRAY WARBLER. 
Dendroeca nigrescens Betpinc, Proc. U. S. Nat. Mus., VI., 1888, 347 (Victoria 
Mts.). 
Dendroica nigrescens Bry Ant, Proc? Calif. Acad. Sci., 2d ser., II. 1889, 809 ( Victoria 
Mts.). 
This is another winter resident, less numerous and widely distributed than 
D. auduboni, but by no means uncommon in places suited to its tastes. Mr. 
Belding seems to have found it only on the mountains “above 3,000 feet alti- 
tude” and “in mountain cafions of about 1,000 feet altitude.” Mr. Frazar’s 
experience was essentially similar, although he took one specimen (perhaps a 
mizrant) at La Pazon March 30. The species was rare at Triunfo in April, 
but common on the Sierra de la Laguna in the latter part of November, and 
at San José del Rancho in December. ll of the ten specimens taken in au- 
tumn appear to be old birds. Mr. Frazar’s latest spring date is April 27, wheh 
a female was shot on La Laguna. 
1 Zoe, IV. 1893, 244. 
