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.)

586. HYLOTERPE FALLAX McGregor.
CALAYAN THICKHEAD.

Sa-mot ba-sit, Calayan.

Calayan (McGregor).

Adult.—Top of head hair-brown washed with olive-green; remainder of upper parts, including exposed edges of wing-feathers and rectrices, dark olive-green; ear-coverts drab; chin and throat white with distinct dusky shaft-lines, bordered posteriorly by a crescentic, dusky band of drab, washed posteriorly with olive; breast, abdomen, and crissum yellow, pale for the greater part, but bright lemon-yellow on crissum; sides of breast and flanks dusky olive-green; feathers of thighs gray, tipped with yellow; edge of wing, under wing-coverts, and axillars white washed with yellow; inner webs of quills edged with white. Bill black; legs plumbeous; nails flesh-color. Measurements of male cotype: Length, 152; wing, 83; tail, 64; culmen from base, 17; bill from nostril, 11; tarsus, 21. Female cotype, wing, 79; tail, 67; culmen from base, 17; bill from nostril, 11; tarsus, 21.