Prioniturus waterstradti Rothschild, Bull. Brit. Orn. Club (1904),
14, 72; Hartert, Novit. Zool. (1906), 13, 756; Grant, Ibis (1906),
495; McGregor and Worcester, Hand-List (1906), 49.
Mindanao (Waterstradt, Goodfellow).
Male.--"Forehead to the eyes pale blue, the feathers being green
at base; lores and sides of face greenish blue; sinciput and nape
grass-green; scapulars and back green with a slight brownish tinge;
rump light greenish brown; wings outwardly bright green, inner
webs of remiges, blackish from above, pale bluish from below; upper
wing-coverts grass-green, slightly tinged with blue near bend of wing;
rectrices, bright green from above, bluish from below, tipped with dull
black for about 12 to 14 mm., the central pair quite green except the
shaft and spatules, which are dull black; entire under side uniform
yellowish green. Bill (in skin) whitish with leaden-gray base; feet
dark gray. Wing, 152 to 157; tail, about 66, with lengthened central
pair, 120 to 140; culmen from cere, 22; metatarsus, 15. One specimen
marked '[female]' is similar to the male." (Rothschild.)
This species is known from specimens collected by Waterstradt on
Mount Apo at 900 meters elevation, and by Goodfellow at 2,500 meters.