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.”