CH.ETURA. 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 (1900), 59. 

 Collocalia linchi isonota Gberholser, Proc. Acad. Xat. Sci. Pliilad. (1900), 



58, 208. 



Pi-ping-au, Benguet. 



Bongao (Evereit) ; Luzon {^yhitehcad, McGregor) ; Mindanao (Koch d- 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 23.3 by 13.9 and 21.5 

 by 13.9. 



Genus CH^TUEA 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'. Much larger; length, over 200 mm.; chin and throat lilack. 



h^. No wliite spot on side of forehead gigantea (p. o57) 



v. A large white spot on each side of forehead. 



c^. Under wing-coverts uniform dark bro^vn celebensis (p. 358) 



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



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



picina ( p. .{.59) 

 320. CH/ETURA GIGANTEA (Temminck). 

 GIANT SPINE-TAILED SWIFT. 



Cypsehis gigantcus Temminck, PI. Col. (1825), 364. 



Chcptura gigantea Hartert, Cat. Birds Brit. Mus. (1892), 16, 475; Sharpe, 



Hand-List (1900), 2, 91; McGregor and Worcester, Hand-List (1906), 



59. 



Calamianes (Worcester, Ccle.stiiw) ; Pahiwan [Whitehead, Platen, Siecre Eivp.. 

 Bour~ns d Worcester, Celestino, Wh'te) . Sumatra, Malay Peninsula, Java, Borneo. 



