COLLOCALIA. 353 



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 (Mc- 

 Gregor, 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. Measure- 

 ments 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, respec- 

 tively, 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 

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