866 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiv. 
present determinable. It is quite probable, however, that this will 
ultimately prove to be the case, for the region intervening between 
the known i-ange of leucanslptila and southern Nevada is generally 
similar to that along the Mexican boundary, and of the breeding horned 
larks from this area we as yet know practically nothing. 
Eleven specimens have been examined, representing the localities 
that follow: 
Arizona. — Yuma.* 
California. — Coyote Well, San Diego County. 
NevacLa. — Ash Meadows. 
Lower California. — Gardners Lagoon;* Colorado River at Monu- 
ment 20i (United States and Mexican boundary line). 
OTOCORIS ATLAS Whitaker. 
Otocorifs atlas Whitaker, Bull. Brit. Orn. Club, VII, No. LIII, 1898, p. xlvii; 
Ibis, 1898, p. 604, pi. xiii. 
Chars, sp. — Similar to Otocoris alpesfris flava., but the nape much 
more rufescent, the throat and superciliary stripe paler, the horns 
longer. 
Measurements. — Male: wing, 111.2 mm. ; culmen, 15 mm.; tarsus, 
20 mm. Female: wing, 102.5 mm.; culmen, 12.5 mm.; tarsus, 
17.5 mm. 
Type locality. — Glaoui,^ Great Atlas Mountains, Morocco. 
Geographical distrihution. — Atlas Mountains, Morocco. 
Description. — "Adult male. Resembles O. elwesi., but differs from 
that species in having the upper wing-coverts of a uniform sandy- 
brown colour, the same as the back, and not vinaceous, while the hind 
crown and nape are of a rich rufescent hue, and the upper throat of a 
pale sulphur colour. The black of the lower throat and of the cheeks 
is distinctly separated by a yellowish- white patch, as in 0. alpestris., 
while the general colour of the upper parts, the black band over the 
base of the bill, the bill itself, and the long hornlets are all as in O. 
penicillata. Iris brown; bill grayish black; legs black.'"' 
'"''AdMlt female. — General colour as in male, but wanting the black 
band on fore crown; the dark cheek-patch but faintly marked; black 
hornlets much shorter; lores and narrow streak over base of bill 
brownish instead of black; frontal light band soiled yellowish; crown 
streaked with dark brown; hind neck slightly rufescent. Soft parts 
as in male.'"' 
This Otocoris differs from all the forms of both O. penicillata and 
0. longirostris in having a yellow throat, and additionall}^ from the 
former in having the black of the jugulum separated from that of the 
^ In the original description given as Glani, but this is eviden*" a mistake. 
MVhitaker, Ibis, 1898, pp. 604-605. 
''Idem, p. 605. 
