A Manual of Philippine Birds

by Richard C. McGregor

• a¹. Upper parts olive-green.
  • b¹. Breast, abdomen, and crissum lemon-yellow, or at least washed with yellow.
    • c¹. Breast and abdomen bright lemon-yellow.
      • d¹. Larger; bill longer; back duller olive-green. philippinensis (p. [599])
      • d². Smaller; bill shorter; back brighter olive-green. apoensis (p. [600])
    • c². Breast, sides, and abdomen washed with yellow.
      • d¹. Smaller; breast and sides less strongly washed with yellow. fallax (p. [601])
      • d². Larger; breast and sides more strongly washed with yellow. illex (p. [601])
  • b². Breast olivaceous gray; abdomen white; crissum pale yellow. albiventris (p. [602])
• a². Upper parts brown.
  • b¹. Smaller; wing, about 80 mm.; tail, 62; upper parts hair-brown, slightly olivaceous. whiteheadi (p. [602])
  • b². Larger; wing, 84 mm. or more; tail, 66 or more.
    • c¹. Larger; upper parts mars-brown. winchelli (p. [603])
    • c². Smaller; upper parts dark walnut-brown; auriculars vinaceous cinnamon. homeyeri (p. [603])

584. HYLOTERPE PHILIPPINENSIS Walden.

LUZON THICKHEAD.

• Hyloterpe philippinensis Walden, Ann. & Mag. Nat. Hist. (1872), 10, 252; Trans. Zool. Soc. (1875), 8, 179, pl. 31, fig. 2; Grant and Whitehead, Ibis (1898), 241 (eggs); Whitehead, Ibis (1899), 225 (habits, nest); Sharpe, Hand-List (1903), 4, 313 (part); McGregor and Worcester, Hand-List (1906), 93 (error in locality list).
• Pachycephala philippinensis Gadow, Cat. Birds Brit. Mus. (1883), 8, 221.

Luzon (Meyer, Whitehead, McGregor).

Adult.—Top of head and hind neck olive-brown, shading into dull olive-green on back; lighter olive-green on rump, tail-coverts, and edges of wing-feathers and rectrices; lores and ear-coverts drab; chin, throat, and malar region white; chin-feathers with black shafts; throat with obscure drab shaft-lines; sides of fore breast olive-yellow; remainder of under parts bright lemon-yellow. Iris brown; bill black; legs and nails flesh-color. Length, about 150. A male from Bataan Province, Luzon, measures: Wing, 84; tail, 69; culmen from base, 16; bill from nostril, 11; tarsus, 19. A female from the same locality, wing, 81; tail, 66; culmen from base, 16; bill from nostril, 11; tarsus, 20.

585. HYLOTERPE APOENSIS Mearns.

MOUNT APO THICKHEAD.

• Hyloterpe philippinensis Grant and Whitehead, Ibis (1898), 241, pl. 5, fig. 1 (egg); Sharpe, Hand-List (1903), 4, 313 (part); Oates and Reid, Cat. Birds’ Eggs (1905), 4, 299, pl. 13, fig. 18.
• Hyloterpe apoensis Mearns, Proc. Biol. Soc. Wash. (1905), 18, 86; McGregor and Worcester, Hand-List (1906), 93; Grant, Ibis (1906), 475 (critical); McGregor, Phil. Jour. Sci. (1907), 2, sec. A, 329 (Bohol).
• Hyloterpe apoensis basilanica Mearns, Proc. U. S. Nat. Mus. (1909), 36, 442.[77]

Pbe’a-oi-toi, Bagobo of Mount Apo.