864 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiv. 
Thi.s d(^sert race seems to be closely allied to adasta, from which, 
however, it ma>^ be distinguished by its decidedly paler coloration 
above and noticeably less reddish back. It may be separated from 
aiHinoplitJa l)y its paler, more uniform upper surface, the back being 
without blackish and the line separating the cervix almost obliterated; 
from actla it is b}^ the same characters still more different; and it 
differs from occidcntnlh in smaller size, as well as very much lighter 
coloration of the entire upper svirface. 
The tj'pe of pallida^ which apparently represents the breeding birds 
of the region immediately about the head of the Gulf of California, 
at least on the eastern side, seems to be the only individual pi'operly 
referable to this subspecies. The two specimens from Santa Rosalia 
Bay, Lower California, a locality included by Dr. Dwight in his range 
oi IKiJlldn^^ seem to belong rather to actla^ for reasons already given.^ 
The specimens from Magdalena Bay, which he also records as pallida^ 
have not been examined, but in all prol^ability they resemble those 
from Santa Rosalia Bay. Should this prove to be so, i^alUda must, at 
least for the present, be expunged from the North American list, and 
its geographical distribution restricted to the neighborhood of the 
mouth of the Colorado River, in northwestern Sonora, Mexico. How 
far to the southward along either shore of the Gulf it extends can 
be of course only conjectured, and is an interesting point for future 
observations to determine. 
OTOCORIS ALPESTRIS LEUCANSIPTILA, new subspecies. 
CJia/rs. 6- ?^J.S7^.— 'Similar to Otocoris a. jxdlida, but even paler, the 
cervix and bend of wing much less cinnamomeous. 
Measurements {6 males). — Wing, 100-107 (average, 102,9) mm.; tail, 
65-70 (average, 67.9) mm.; exposed culmen, 10.5-12 (average, 11.2) 
mm.; tarsus, 21-22 (average, 21.3) mm.; middle toe, 10.5-11.5 (aver- 
age, 11.1) mm. 
Tyj^e locality. — Yuma, Arizona. 
Geograiolilcal distrlhutlon. — Extreme southwestern Arizona, extreme 
southeast corner of California, and northeastern Lower California 
along the international boundary line, north to southern Nevada. 
Descri'jition. — Adult male in Irreeding jjlumage. — T3q3e, No. 132970. 
U.S.N. M.; Yuma, Arizona, March 13, 1894; Mearns and Holzner. 
Back grayish Isabella color, streaked with pale fuscous; rump the 
same, streaked with sepia; wings and two central tail-feathers pale 
fuscous, edged with whitish, buff'y and ochraceous; rest of tail brown- 
ish black, margined exteriorly with white; occiput, cervix, bend of 
wing and upper tail-coverts very pale vinaceous cinnamon; forepart of 
crown, horns, cheeks and jugulum black; forehead, superciliary stripe 
lAuk, VII, 1890, p. 155. 'Antea, p. 848. 
