186 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Geothlypis trichas arizela Oxseru. 
OBERHOLSER’S YELLOW-THROAT. 
Geothlypis trichas (not Turdus trichas Linnaeus) Barrp, Rev. Amer. Birds, pt. I. 
1865, 220, 222, part (Cape St. Lucas). Brxpine, Proc. U.S. Nat. Mus., V. 
1883, 536 (Cape Region). 
Geothlypis trichas occidentalis (not of BREwsTER), Bryant, Proc. Calif. Acad. Sci., 
2d ser., II. 1889, 310 (Cape Region). 
G[eothlypis] trichas occidentalis (not of BrewsTER) Bryant, Zoe, II. 1891, 192 
(San José del Cabo). 
Geothlypis trichas arizela OBERHOLSER, Auk, XVI. 1899, 256-258 (orig. descr.; type 
from Fort Steilacoom, Wash.; La Paz; San José del Cabo). 
The large series of autumnal specimens of this form collected by Mr. Frazar? 
represents very fully the winter plumages of the adult and young of both 
sexes. 
The adult male in autumn has the crown, nape, back, wing coverts, under 
tail coverts, and sides of body strongly tinged with cinnamon (nearly pure 
cinnamon brown on the crown and flanks); the black feathers of the mask 
tipped with grayish on the auriculars and sides of the neck, with mixed gray 
and cinnamon on the forehead;? in every other respect it is similar to the 
male in spring. 
The young male in autumn differs from the adult at the same season in 
having the black of the mask restricted to a broad malar stripe and in possess- 
ing some concealed spotting at the base of the feathers of the forehead. The 
upper parts, also, show less cinnamon, and the entire top of the head is nearly 
concolor with the back. The yellow of the breast is sometimes tinged with 
saffron, but this is also the case with some apparently mature birds. 
The adult female in autumn is rather more olivaceous above than are speci- 
mens of the same sex taken in spring, and the throat and breast are of a deep 
ochre yellow tinged with saffron. The forehead is suffused with cinnamon as 
in the spring female. 
The young female in autumn has the entire under parts nearly uniform 
clayey buff, lightest on the middle of the abdomen, slightly brownish on the 
flanks. The upper parts are plain, dull, grayish olive, nearly uniform every- 
where, but with a slight tinge of cinnamon on the forehead. In some speci- 
mens the breast is suffused with dull yellowish, but none show any yellow on 
the throat. The tint of the under parts varies considerably with different 
1 It is possible that some of the immature Yellow-throats in this series are refer- 
able to G. t. scirpicola, while others may be G. t. sinuosa, but both these forms are 
said by their describer to be “permanently resident” in California (see Grinnell, 
Condor, III. 1901, 65). 
2 In a very few birds there is no trace of this light tipping, the mask being quite 
as pure black as in spring. 
