Part 282

d1. Bill larger. ... cuyensis (p. 706) d2. Bill smaller. ... borneensis (p. 707)

b2. Tips of outer rectrices more recurved; wing, 150 mm. ... worcesteri (p. 707)

a2. Tail much longer than wing; outermost rectrices longer than the next pair by about twice the tarsus. ... menagei (p. 708)

720. CHIBIA PALAWANENSIS (Tweeddale).

PALAWAN DRONGO.

Dicrurus palawanensis Tweeddale, Proc. Zool. Soc. (1878), 614. Chibia palawanensis Sharpe, Ibis (1888), 199; McGregor and Worcester, Hand-List (1906), 107.

Balabac (Everett); Calamianes (Bourns & Worcester, McGregor); Palawan (Everett, Whitehead, Platen, Steere Exp., Bourns & Worcester, Celestino, White).

Adult (sexes similar).--Above blue-black; feathers of crown with glossy scale-like tips, upper tail-coverts, wings, and tail glossy steel-green; sides of neck with glossy green, lanceolate feathers; under parts black; feathers of lower throat and chest somewhat acute and with glossy scale-like tips; the outermost rectrices slightly upturned and twisted near the tip. A male from Palawan measures: Wing, 135; tail, 125; bill from nostril, 21; depth of bill at nostril, 10; tarsus, 23; difference in length between middle and outermost rectrices, 20. A female, wing, 132; tail, 120; bill from nostril, 21.5; depth of bill at nostril, 10; tarsus, 24.

"Habits like those of Dicrurus balicassius and D. striatus. Five males average: Length, 273; wing, 136; tail, 121; culmen, 33; tarsus, 23; middle toe with claw, 25. Five females, length, 267; wing, 133; tail, 118; culmen, 33; tarsus, 23; middle toe with claw, 24. Iris dark brown to black; bill, legs, feet, and nails black." (Bourns and Worcester MS.)

721. CHIBIA CUYENSIS McGregor.

CUYO DRONGO.

Chibia cuyensis McGregor, Bull. Philippine Mus. (1903), 1, 5; McGregor and Worcester, Hand-List (1906), 107.

Tam-bi-bi-li-gao, Cuyo.

Cuyo (McGregor).

Adult (sexes alike).--Wing, tail, and upper tail-coverts dark glossy green; all other parts dark blue-black; feathers of crown, nape, and breast tipped with glossy blue-black; some long hackles on sides of neck; back slightly metallic; outermost rectrices slightly upturned and twisted near the tip. A male (type) measures: Length, 305; wing, 152; tail, 130; bill from nostril, 23; depth of bill at nostril, 12; tarsus, 28; difference in length between the middle and outermost rectrices, 9. A female, wing, 145; tail, 124; bill from nostril, 11.5; tarsus, 27.

This species differs from C. palawanensis in being larger and in having the bill longer and deeper; spangles on chest larger.

722. CHIBIA WORCESTERI McGregor.

WORCESTER'S DRONGO.

Chibia worcesteri McGregor, Bur. Govt. Laboratories (1905), 34, 26; McGregor and Worcester, Hand-List (1906), 107.

Semirara (Worcester).

Male.--Similar to Chibia cuyensis and to C. palawanensis, but with the outermost rectrices more recurved than in either of these; wing longer than in C. cuyensis; bill longer and deeper than in C. palawanensis. The type and only specimen measures: Length, 292; wing, 150; tail, 136; bill from nostril, 22; depth of bill at nostril, 11; tarsus, 24; difference in length between the middle and outermost rectrices, 20.

723. CHIBIA BORNEENSIS Sharpe.

BORNEAN DRONGO.

Chibia borneensis Sharpe, Proc. Zool. Soc. (1879), 246; Worcester and Bourns, Proc. U. S. Nat. Mus. Wash. (1898), 20, 558, no. 298; McGregor and Worcester, Hand-List (1906), 107. Chibia pectoralis Guillemard, Proc. Zool. Soc. (1885), 259, 418. Chibia cagayanensis Mearns, Proc. U. S. Nat. Mus. (1909), 36, 447.

Bongao (Everett); Cagayan Sulu (Guillemard, Mearns); Sibutu (Everett); Tawi Tawi (Bourns & Worcester). Borneo.

Similar to C. pectoralis (Sula Island), "but it may be recognized on comparison by the much smaller and more metallic spots on the throat and fore neck, which are steel-green, as also are the neck-hackles. In C. pectoralis the spangles are large, dull, and inclined to purplish in tint. This species appears to me to be a thorough Chibia. * * *." (Sharpe.)

"The young bird from Kina Balu differs from the adult in being duller black, with fewer and less metallic chest-spots and hackles." (Sharpe.)

"Guillemard thought his Cagayan Sulu specimens to be of the same species with those from Sulu, though he mentions the lack of frontal plumes in the former. Dr. Sharpe has shown that the Sulu-Tawi Tawi birds must be referred to C. borneensis, and if Guillemard was right in believing the Cagayan Sulu birds to be identical with those from Sulu, C. pectoralis must be excluded from the list of Philippine birds.