Male.--Most nearly related to P. discurus but distinguished by the crown patch which in mindorensis is blue with a slight violet tinge and is sharply defined in front against the green forehead; the bill is larger and the rackets are never so long as in adult specimens of discurus. Length, including rackets, 317; wing, 165; tail without rackets, 90; culmen from front margin of cere, 22. Female.--Similar to female of discurus but often with traces of the violet crown patch. Length, including rackets, 300; wing, 160; tail without rackets, 90; culmen from front margin of cere, 21. "Three males average, 268 in length, exclusive of rackets; wing, 162; tail, 135; culmen, 20; tarsus, 21; middle toe with claw, 28. A female measures, 261 in length; wing, 154; tail, 118; culmen, 21; tarsus, 15; middle toe with claw, 27. Iris light straw-yellow, nearly white; legs, feet, and nails light leaden; bill pale horn-color." (Bourns and Worcester MS.) 240. PRIONITURUS CYANEICEPS Sharpe. BLUE RACKET-TAILED PARRAKEET. Prioniturus cyaneiceps Sharpe, Ibis (1888), 194; Hand-List (1900), 2, 29; Salvadori, Cat. Birds Brit. Mus. (1891), 20, 419; McGregor and Worcester, Hand-List (1906), 49. Balabac (Steere, Everett); Calamianes (Bourns & Worcester, McGregor); Palawan (Whitehead, Platen, Steere Exp., Bourns & Worcester, Celestino, White). Male.--All of head, neck, and under parts bright verditer-blue, a little duller below where the feathers are yellowish at base, this when specimen is held toward the light, away from the light the blue parts become light bluish green; under tail-coverts bright greenish yellow and tipped with green; wings, back, and rump grass-green; tail-spatules black, touched with green; short rectrices green, deep blue along the shaft, tip black. Bill bluish white; legs blackish. A male from Palawan measures: Wing, 150; tail without rackets, 77; culmen from front margin of cere, 19. Female.--Differs from the male in having the blue restricted to top and sides of head and in having the lower parts uniform light green with traces of blue; under tail-coverts deeper yellow than in the male. Young.--"Green, with no verditer-blue shade on the head and neck; greater wing-coverts and secondaries edged with yellowish green; under parts yellowish green; under tail-coverts yellow, washed with greenish; middle tail-feathers longer than the lateral ones, narrow towards the point and entirely webbed." (Salvadori.) "Ten males from Busuanga measure, 238 in length (exclusive of rackets, which may attain a length of 60 to 75); wing, 154; tail, 77; culmen, 19; tarsus, 14; middle toe with claw, 26. Seven females average, 233 in length; wing, 150; tail, 76; culmen, 19; tarsus, 15; middle toe with claw, 26." (Bourns and Worcester MS.) 241. PRIONITURUS LUCONENSIS Steere. LUZON RACKET-TAILED PARRAKEET.