CENTURA. 357 



This species has been very rare in collections; the only specimen in 

 the British Museum in 1892 was a skin of doubtful locality collected by 

 von Othberg. We have met with it on several islands; in Sibuyan and 

 Calayan it was extremely abundant. 



319. COLLOCALIA ISONOTA ( Oberholser ) . 



OBERHOLSER'S SWIFTLET. 



Collocalia linchi SHARPE, Hand-List (1900), 2, 90 (part) ; GATES and REID, 



Cat. Birds' Eggs (1903), 3, 77 (part). 



Salangana linchi MCGREGOR and WORCESTER, Hand-List (1906), 59. 

 Collocalia linchi isonota OBERHOLSER, Proc. Acad. Nat. Sci. Philad. (1906), 

 58, 208. 



Pi-ping-au, Benguet. 



Bongao (Everett); Luzon (Whitehead, McGregor); Mindanao (Koch & Scha- 

 denberg) ; Mindoro (McGregor, Porter). 



Adult. About the size of and very much like Collocalia marginata but 

 without white margins to tail-coverts, and with more white on the 

 abdomen. 



Young. The young bird resembles the adult in plumage but the 

 tarsi are flesh-color. 



Nest. Composed of moss or lichens and placed on the ground in the 

 protection of grass or ferns. Two eggs measure 22.3 by 13.9 and 21.5 

 by 13.9. 



Genus CH^ETUBA Stephens, 1826. 



Size large, length 100 to 200 mm. or even more ; shafts of tail-feathers 

 very stiff and extending a short distance beyond the webs; claws strong 

 and curved. Birds of this genus are very strong and steady in flight 

 and usually feed high in the air. 



Species. 



a 1 . Much larger; length, over 200 mm.; chin and throat black. 



6 1 . No white spot on side of forehead gigantea (p. 357) 



6 2 . A large white spot on each side of forehead. 



c l . Under wing-coverts uniform dark brown celebensis (p. 358) 



c 2 . Under wing-coverts edged with white dubia (p. 359) 



a 2 . Much smaller; length, less than 120 mm.; chin and throat white. 



picina (p. 359) 



320. CH/CTURA GIGANTEA (Temminck). 



GIANT SPINE-TAILED SWIFT. 



Cypselus giganteus TEMMINCK, PI. Col. (1825), 364. 



Chcetura gigantea HAETEBT, Cat. Birds Brit. Mus. (1892), 16, 475; SHABPE, 



Hand-List (1900), 2, 91; MCGREGOR and WORCESTER, Hand-List (1906), 



59. 



Calamianes ( Worcester, Celestino ) ; Palawan ( Whitehead, Platen, Steere Exp., 

 Bourns & Worcester, Celestino, Wh*te). Sumatra, Malay Peninsula, Java, Borneo. 



