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. [80]
Pbe'a-oi-toi, Bagobo of Mount Apo.
Basilan (Steere Exp., Bourns & Worcester, McGregor, Mearns); Bohol
(McGregor); Dinagat (Everett); Leyte (Whitehead); Mindanao (Bourns
& Worcester, Mearns, Goodfellow, Celestino); Samar (Steere Exp.,
Bourns & Worcester, Whitehead); Siquijor (Steere Exp., Bourns &
Worcester, Celestino).
Adult.--Similar to H. philippinensis, but the bill decidedly smaller
and the back bright olive-green. A male topotype measures: Wing,
82; tail, 68; culmen from base, 14; bill from nostril, 9; tarsus,
18.5. Specimens from Bohol differ in having larger bills. A male
measures: Wing, 75; tail, 62; culmen from base, 15; bill from nostril,
10. A male from Siquijor measures: Wing, 84; tail, 69; culmen from
base, 17; bill from nostril, 11.
Whitehead found a set of two eggs of the Mount Apo thickhead
near Paranas, Samar, in June, 1896. The eggs are thus described:
"Shape ovate. Ground-color brownish cream-color, shading into a zone
of deeper color round the larger end; the zone is ornamented with
spots of pale sienna-brown and larger underlying markings of bluish
gray. Measurements 23 mm. by 17 mm.
"Nest cup-shaped, very similar to that constructed by Iole
philippensis, and composed of similar materials--fine roots and dead
leaves. It was situated in the undergrowth of old forest in a small
tree about three meters from the ground, and the female bird was
obtained." (Grant and Whitehead.)