202 PROCEEDINGS OF THE ACADEMY OF [April, 



parts; less whitish rump band and darker abdomen, both with more 

 distinct dusky or blackish shaft lines. From Collocalia f. terraereginae it 

 may be distinguished by its much larger size, lighter, more brownish 

 upper surface, and more conspicuous dark shaft lines on the posterior 

 lower parts. From Collocalia f. inexpectata it differs in its decidedly 

 paler under surface; lighter, more brownish upper parts; and more 

 prominent, less brownish, light rump band ;but occasional intermediate 

 individuals occur that are difficult to distinguish. The dark shaft lines 

 of the lower surface vary much in different individuals, being apparently 

 most evident in immature birds. The measurements of this form given 

 by Hartert ^^ are rather too large, as may be seen by reference to the 

 above averages, but were probably taken from a limited number of 

 specimens. A series of birds from Trong, Lower Siam, and another 

 from the Philippine archipelago seem to be identical, and together 

 are certainly all referable to this race, although a few of those from 

 Cagayan Sulu, in the southwestern Philippines, are more blackish 

 above and show in this, but not in size, some vergence toward Collocalia 

 francica terraereginae. There are examples in the United States National 

 Museum from the following islands of the Philippines: Panay; Cagayan 

 Sulu; and Cagayancillo, in the Cagayanes group. It has also been 

 recorded as Collocalia francica from Cuyo, Negros and Calamianes. 

 All Philippine records of both francica and inexpectata refer of course 

 to germani. 



The identity of Collocalia germani Oustalet and Collocalia francica 

 merguiensis Hartert may be considered as conclusively established, for 

 Dr. Hartert assures us ^^ that he has compared the types. That 

 germani is rightly considered a subspecies of Collocalia francica seems 

 to be equally certain, for Dr. R. Bowdler Sharpe, who at our request 

 carefully examined the series of merguiensis in the British Museum, 

 informs us ^*' that there is not the slightest indication of tarsal feather- 

 ing on any of the specimens. 

 Collocalia troglodytes Gray. 



Collocalia troglodytes Gray, Gen. Birds, I, 1845, p. 55, pi. 19. 



Chars, sp. — Very much smaller than Collocalia francica francica; 

 upper parts, including wings and tail, black with a metallic greenish 

 or bluish gloss; a pure white, well-defined rump band, the feathers of 

 which have blackish shafts and most of them dark tips; abdomen 



38 Cat. Birds Brit. Mus., XVI, 1892, p. 506; Tierreich, I, 1897, p. 69. 

 3» In litt. 

 « In litt. 



