Part 136

b2. A whitish or grayish band across rump. ... germani (p. 355)

a2. Smaller; wing, 106 mm. or less; lower parts mottled with white; middle of belly extensively white.

b1. A white band across the rump. ... troglodytes (p. 355) b2. Without white band on rump.

c1. Upper tail-coverts margined with white. ... marginata (p. 356) c2. Upper tail-coverts concolorous with back. ... isonota (p. 357)

312. COLLOCALIA LOWI (Sharpe).

LOW'S SWIFTLET.

Cypselus lowi Sharpe, Proc. Zool. Soc. (1879), 333. Collocalia lowi Hartert, Cat. Birds Brit. Mus. (1892), 16, 498; Sharpe, Hand-List (1900), 2, 89; Oates and Reid, Cat. Birds' Eggs (1903), 3, 75; Oberholser, Proc. Acad. Nat. Sci. Philad. (1906), 58, 190. Salangana lowi McGregor and Worcester, Hand-List (1906), 58.

Palawan (Everett, Whitehead, Steere Exp.). Northern Borneo, Anamba Islands, accidental in Sumatra and on Nias Island.

Adult.--"Upper surface sooty black with a little greenish gloss, somewhat purplish on the tail; lower surface brownish gray, with somewhat darker shaft-stripes; feathers in front of eye white, broadly tipped with black; under wing-coverts blackish. Length, about 127; bill at base, 5; wing, 135; tail, 51; nearly quite even; tarsus, 102; thinly but obviously feathered if not abraded by the string of the label." (Hartert.)

Young.--Similar to the adult.

Everett found nesting colonies of Low's swiftlet in Palawan and in northern Borneo during the month of October; the nests were made of moss and were fastened to the walls of caves with dry saliva.

313. COLLOCALIA WHITEHEADI Grant.

WHITEHEAD'S SWIFTLET.

Collocalia whiteheadi Grant, Ibis (1895), 459; Sharpe, Hand-List (1900), 2, 89; Oberholser, Proc. Acad. Nat. Sci. Philad. (1906), 58, 192. Salangana whiteheadi McGregor and Worcester, Hand-List (1906), 58. Collocalia unicolor amelis Oberholser, Proc. Acad. Nat. Sci. Philad. (1906), 58, 193.

Bantayan (McGregor); Batan (McGregor); Bohol (McGregor); Cagayancillo (McGregor); Cebu (McGregor); Luzon (Whitehead, McGregor); Mindoro (McGregor, Porter); Sibuyan (McGregor); Palawan (Whitehead, White); Verde (McGregor).

Adult.--Similar to Collocalia lowi in coloration but slightly larger with the tail distinctly forked and the tarsi entirely devoid of plumes. Iris brown; bill and nails black; legs dark reddish brown. Measurements from ten skins of each sex from Irisan, Benguet Province, are: Males, wing, pressed flat against the rule, 119 to 125; tail, 46 to 51; depth of fork, 5 to 8. Females, wing, 118 to 125; tail, 48 to 56; depth of fork, 6 to 9.

Young.--Nestling; similar to the adult but more sooty above and lacking the green gloss; lower parts grayer. Iris dark brown; bill and nails black; legs pale flesh.

Nest.--In Benguet Province, Luzon, eggs and nestlings were found in June. The nests were made of green moss and placed in a water-worn cave. The eggs are pure white. Two specimens measure, respectively, 22.3 by 13.9 and 23.6 by 14.2.

314. COLLOCALIA ORIGENIS Oberholser.

MINDANAO SWIFTLET.

Collocalia origenis Oberholser, Proc. Acad. Nat. Sci. Philad. (1906), 58, 191.

Mindanao (Mearns, Celestino).

Adult.--"Upper surface uniform brownish black, the rump not lighter but wings and the distinctly forked tail more brownish, their feathers paler along the inner margins; entire ventral surface uniform smoky hair-brown, the throat not paler; sides of head and neck darker brown than the under parts; a blackish spot in front of the eye; lining of wing blackish brown.

"In its large size, deeply emarginate tail, and lack of tarsal feathering Collocalia origenis agrees with Collocalia whiteheadi, but is readily distinguishable by the dark colors, particularly on the upper parts which are even more blackish than in Collocalia fuciphaga from the Philippines."

Oberholser gives measurements of two males as follows: Wing, 129, 138; tail, 53, 60; exposed culmen, 6, 5.5; tarsus, 13, 14. Two females: Wing, 134, 130; tail, 51, 54; exposed culmen, 5.5; tarsus, 12.5, 14.

"This new species was discovered by Doctor Mearns during his recent trip to the Island of Mindanao, the four adults obtained having been brought by natives who had found them in a cave on Mount Apo." (Oberholser.)

315. COLLOCALIA FUCIPHAGA (Thunberg).

THUNBERG'S SWIFTLET.