CHETURA. 351 
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) ; OATES and REID, 
Cat. Birds’ Eggs (1903), 3, 77 (part). 
Salangana linchi McGrecor and WorceEsTER, Hand-List (1906), 59. 
Collocalia linchi isonota OBERHOLSER, Proc. Acad. Nat. Sei. 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 CHAZTURA 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 black. 
bo Nor white spot onside of forehead ..-2 12 ee gigantea (p. 357) 
b*. A large white spot on each side of forehead. 
ce’. Under wing-coverts uniform dark brown........................- celebensis (p. 358) 
¢. Under wing-coverts edged with white..................2-2--2--Jessc---0- dubia (p. 359) 
a. Much smaller; length, less than 120 mm.; chin and throat white. 
picina (p. 359) 
320. CHAETURA GIGANTEA (Temminck). 
GIANT SPINE-TAILED SWIFT. 
Cypselus giganteus TEMMINCK, Pl. Col. (1825), 364. 
Chetura gigantea HARTERT, Cat. Birds Brit. Mus. (1892), 16, 475; SHARPE, 
Hand-List (1900), 2, 91; McGrecor and WorcesTER, Hand-List (1906), 
59. 
Calamianes (Worcester, Celestino) ; Palawan (Whitehead, Platen, Steere Ezxp., 
Bourns & Worcester, Celestino, Wh’te). Sumatra, Malay Peninsula, Java, Borneo. 
