COLLOCALIA. 353 



darker shaft-stripes; feathers in front of eye white, broadly tipped with 

 black; under wing-coverts blackish. Length, about 137; 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." {Hartcrt.) 



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. 



WHITEHEAB'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. (1900), 

 58, 193. 



Bantayan {McGregor) ; Batan (McGregor) ; Bohol {McGregor) ; Cagayancillo 

 {McGregor) ; Cebii {McGregor) ; Luzon {Whitehead, McGregor) ; Mindoro {Mc- 

 Gregor, Porter) ; Sibnyan (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 browni. 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. — Xestling; similar to the adult but more sooty above and 

 lacking tlie 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 watei'- 

 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, Celcsti)w) . 



Adult. — ''Upper surface uniform brownish l)lack, the rump not lighter 

 biit wings and the distinctly forked tail more brownish, their feathers 

 )>aler along the inner margins; entire ventral surface uniform smoky 

 777 H) 23 , 



