CH2TURA. 359 
322. CHAETURA DUBIA McGregor. 
PHILIPPINE SPINE-TAILED SWIFT. 
Chetura dubia McGReEcor, Bur. Govt. Lab. Manila (1905), 34, 15, pl. 12: 
McGrecor and WoRCESTER, Hand-List (1906), 59. 
Mindoro (McGregor). 
Adult.—General color blackish brown; back and rump _ noticeably 
lighter, being light seal-brown, each feather with a subterminal, more or 
less concealed area or band of bluish violet; head and body shot with 
bluish violet gloss, strongest on chin, throat, breast, and sides of head 
and neck; a large white patch on each side between nostril and lores; 
crissum white, each feather blackish brown at its base, the long tail- 
coverts with edges also blackish brown except near tip; extending diago- 
nally upward and forward on each flank, a wide white stripe connected 
with the white crissum behind as in Chetura gigantea; exposed edges of 
wing-feathers black, inner webs of primaries largely light brown; inner 
webs of alula, primary- and secondary-coverts shot with greenish blue 
gloss; tertiaries greenish blue; lining of wing brown, each feather bor- 
dered with dirty white which has its greatest extent on innermost feather ; 
axillars dark brown, shot with bluish violet gloss, exposed portion of 
tail blackish, the concealed basal portion glossed with green and blue. 
Bill black; iris brown; legs and feet reddish flesh; nails light brown. 
Male: Length, 229; wing, 220; tail, 64; bill from frontal feathers, 
10; bill from anterior margin of nostril, 7; tarsus, 18. Female: Length, 
234; wing, 218; tail, 64; bill from frontal feathers, 10; bill from 
anterior margin of nostril, 7; tarsus, 18. 
This fine species is known from the type specimens, a pair taken on 
the Baco River, Mindoro. It requires comparison with Chetura cele- 
bensis. The following notes probably refer to Chetura dubia: 
“We think it probable that C. gigantea will eventually be found in 
Mindoro. We repeatedly saw a very large swift in that island, but it 
always kept well out of range. We thought it to be C. gigantea but 
could not, of course, be at all sure. On our first trip we found C. gigantea 
flying low over the mangrove swamps in Palawan and had no special 
difficulty in securing specimens. On our second trip, however, we were 
less fortunate, as the few individuals that we saw kept out of range.” 
(Bourns and Worcester MS.) 
323. CHAETURA PICINA Tweeddale. 
TWEEDDALE’S SPINE-TAILED SWIFT. 
Chetura picina TWEEDDALE, Proc. Zool. Soe. (1878), 944, pl. 59; Harrert, 
Cat. Birds Brit. Mus. (1892), 16, 487; SHARPE, Hand-List (1900), 2, 
92; McGregor and WorcESsTER, Hand-List (1906), 59. 
Leyte (Whitehead) ; Mindanao (Everett). 
