BIRDS OF NORTH AND MIDDLE AMERICA. 5387 
scapulars, and upper part of rump dusky gray (dark quaker drab); 
wings neutral gray, becoming paler anteriorly and quite white on 
anterior lesser coverts and outer margin of wing; lower rump and 
upper tail-coverts immaculate white, sometimes pale gray; tail 
grayish white or very pale gray, more decidedly grayish terminally; 
anal region and under tail-coverts immaculate pure white; axillars 
and under wing-coverts deep gray; bill dusky (dull reddish in life); 
iris dark brown; legs and feet coral red or orange-red (in life). 
Adults in winter.—“ In the latter part of July, when the molt begins 
(in Europe), the bird is curiously parti-colored, the new feathers of the 
head, neck, and under parts being white and those of the back gray 
(paler than in Hydrochelidon nigra). .. . Later, the under parts, 
including the under wing-coverts and axillaries, become white, the 
crown of the head and the nape being merely mottled with black; 
but by the following April the black color has reappeared to a con- 
siderable extent, especially on the axillaries.” * 
Immature.—“In birds which are not mature, though capable of 
breeding, the black of the under parts has a brownish tinge and the 
tail-feathers are pearl-gray, especially toward the tips.” ¢ 
Young.— Posterior portion of the crown, a patch on the side of the 
head, and one on the hind-neck dark sooty gray, the feathers with 
lighter margins, the patch on the hind-neck with brownish markings; 
rest of the head, neck, and entire under parts pure white; back and 
scapulars blue-gray, broadly tipped with blackish gray; wings as in 
the adult in winter, but the wing-coverts tipped with light reddish 
brown; rump and upper tail-coverts white; tail light French gray, 
becoming darker toward the tip.” > 
Downy young.— Upper parts warm reddish buff, boldly marked 
with black on the crown, nape, back, wings, and rump; under parts 
grayish buff with a sooty tinge, marked with sooty gray on the upper 
throat; space round the eye nearly white.’”’® 
Adult male.-—Wing, 196.5-209 (201.6); tail, 65.5-76 (70); exposed 
culmen, 23-26.5 (24.3); tarsus, 16-20 (18.2); middle toe, 15.5-19 
(16.8).° 
@ Saunders, Cat. Birds Brit. Mus., xxv, 1896, 9. 
6 Dresser, Birds of Europe. 
¢ Hight specimens. No adult females measured. 
Ex- 
Locality. Wing. | Tail. bad Tarsus. _ 
men, 
MALES, 
Three adult males from Europe.....-....2----26.seeee eee ee eee 200. 8 68.7 22.8 18.5 17 
Two adult males from British East Africa (August 9).....-..-- 203. 2 68 24.2 18 16.5 
Two adult males from northern China (Tientsin) (H. 1. grisea).; 203.5 70.2 25.7 17 16.5 
One adult male from Philippine Islands (Mindanao, June) (H. = 
bs QTESEG) i sieisrerctacorarccarstctaveinisin ele niainve aieheidinynlestin es cscrasSiettheraiainepsawisinier 197 76 26 20 17.5 
