870 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiv. 
Meamirements {3 males). — Wing, 120.5-125 (average, 123.5) mm.; 
tail, 87-90 (average, 88.3) mm.; exposed culmen, 12.5-14 (average, 
13.3) mm.; tarsus, 21.5-23.5 (average, 22.8) mm.; middle toe, 11-13 
(average, 11.8) mm. 
Type locality. — Tsokr Cliumo Lake, Ladak. 
Geograjyhical distrlhution. — Ladak, central Asia. 
Description. — Adult male in hreeding pliunage. — Type, No, 162845, 
U.S.N.M.; Tsokr Chmno Lake, Ladak, July 11, 1897; Dr. W. L. 
Abbott. Back cinnamon, with a rufescent tinge; wings and middle 
pair of tail-feathers fuscous, edged with bufly and cinnamon buff; 
occiput, cervix, bend of wing and upper tail-coverts pinkish vinaceous, 
palest on the last; crown, horns, lores, cheeks and jugulum black; 
forehead, superciliary stripe, auriculars, chin, throat and rest of lower 
surface white, the sides shaded with cinnamon and streaked with dusky. 
Adtilt female in hreeding plu7n.age.—~^o. 162844, U.S.N.M. ; Fotu-la 
Pass, Ladak, 1897; Dr. W. L. Abl)ott. Back, rump, wings and 
middle tail-feathers sepia, the feathers all margined with buffy; 
cervix pale pinkish buff, streaked with sepia; upper tail-coverts 
cinnamon, with a pinkish tinge; black of crown mixed with buffy; 
auriculars grayish; otherwise like the breeding male. 
Adult male vn wintei' plumage. — No. 112625, U.S.N.M.; Jouttak, 
Ladak, September 15; J. Biddulph. Similar to the breeding male, 
but upper parts more uniform and much more grayish, the occiput, 
cervix and bend of wing more pinkish; the black of head obscured, 
and the breast slightly spotted with dusky. 
Young in first plumage. — No. 150217, U.S.N.M.; Khardong Pass, 
Ladak, July 13, 1893; Dr. W. L. Abbott. Upper parts clay color, 
each feather with a subterminal bar of sepia and a terminal spot of 
buffy; wings and tail sepia, margined with buffy white and ochraceous 
buff'; sides of head mixed brownish and dull pale yellowish; chin and 
throat yellowish white; jugulum, breast and sides of body j^ellowish 
white, streaked and spotted with dark brown. 
Though heretofore always confused with longirostris., this new race 
may be distinguished from that form by its smaller size and more 
ochraceous or rufescent coloration above. Li y^xntox perissa is appar- 
ently rather darkei' than longirostris. From elwesi the present race 
differs in l)eing larger, considerably paler, and somewhat more 
grayish above. That neither this nor the following subspecies {O. I. 
argaled) is the same as Otocoris teleschonii Prejewalsky may at once 
be seen hy a comparison of measurements. 
This is the onl}' form of either penicillata or longirostris of which 
the young in first plumage is available for comparison. A single 
specimen from Khardong Pass, Ladak, is here considered as belonging 
probabl}^ to jjerissa., though no adults from the same place have been 
examined. Compared with the 3'oung of Otocoris alpestris alpestris^ 
