BIKDS OF THE AMMBA ISLANDS. 27 



species of Collocalia lowi, a bird with well-feathered tarsi, is clearly 

 doing it violence; and this the more since true Collocalia lowi with 

 feathered tarsi occurs also on Palawan Island, 1 the very locality 

 from which comes its supposed subspecies palawanensis! This last 

 fact was apparently overlooked by Mr. Stresemann in diagnosing 

 Collocalia whiteheadi palawanensis. 



The bird from Mindanao Island, described by the writer as Collocalia 

 origenis, 2 which Mr. Stresemann, 3 without examining any specimens, 

 suggests is possibly the same as Collocalia whiteheadi, is undoubtedly 

 distinct from the latter. That it may eventually prove to be a geo- 

 graphical race of that species may well be so; but the original speci- 

 mens in the United States National Museum, which, so far as we know, 

 are all that exist in any collection, certainly do not indicate such to be 

 the case. This bird has an entirely unfeathered tarsus, like Collocalia 

 wliitelieadi, of the island of Luzon, but differs from that species in its 

 decidedly darker, more blackish, and more uniform coloration above, 

 the rump not being appreciably lighter than the back; and in its 

 also much darker and more uniform lower surface, with the throat 

 not noticeably if at all paler than the breast and abdomen, instead 

 of decidedly lighter, as in Collocalia whiteheadi whiteheadi and 

 Collocalia whiteheadi palawanensis. In fact, Collocalia origenis is 

 decidedly darker above than even Collocalia lowi, and fully as dark 

 and uniform, in some specimens darker, below than is that species; 

 and in the general aspect of its coloration is really more like Collocalia 

 lowi than like Collocalia. lohiteheadi. It is, however, of course, readily 

 separable from the former by its unfeathered tarsi, and also by the 

 almost total absence of blackish shaft-lines on the feathers of the 

 posterior lower parts, in addition to the color differences already 

 noted. 



COLLOCALIA VESTITA AMECHANA Oberholser.< 



Collocalia fuciphaga amechana Oberholser, Proc. U. S. Nat. Mus., vol. 42, March 

 6, 1912, pp. 12, 13 (Pulo Jimaja, Anamba Islands). 



Doctor Abbott obtained only two specimens of this swiftlet: 



Adult female, No. 171071, U.S.N.M.; Pulo Jimaja, September 19, 

 1899. Length, 127 mm. 



Adult female, No. 171072, U.S.N.M.; Pulo Jimaja, September 19, 

 1899. Length, 124 mm. 



These are both more or less in process of molt. They have been 

 fully discussed in previous papers. 5 The second specimen mentioned 

 above is the type of the subspecies. 



i See Grant, Ibis, 1895, p. 400. 



2 Proc. Acad. Nat. Soi. Pbila., July 26, 1906, p. 191. 



3 Verhandl. Ornith. Gesells. Bayern, vol. 12, May 1.5, 1914, p. 11. 



1 For the change of specific name, sec Stresemann, Verhandl. Ornith. Ges. Bayern, vol. 12, May 15, 1914, 

 pp. 2-6. 

 5 Oberholsrr, Proc. Acad. Nat. Sci. Pbila., 1906, p. 189; Proc. U. S. Nat. Mus., vol. 42, Mar. 6, 1912, p. 13. 



