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.)