600 MANUAL OF PHILIPPINE BIRDS. 



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, pi. 5, fig. 

 1 (egg); SHARPE, Hand-List (1903), 4, 313 (part); GATES and REID, 

 Cat. Birds' Eggs (1905), 4, 299 pi. 13, fig. 18. 



Hyloterpe apoensis MEARNS, Prpc. Biol. Soc. Wash. (1905), 18, 86; MC- 

 GREGOR and WORCESTER, Hand-List (1906), 93; GRANT, Ibis (1906), 

 475 (critical); McGREGOB, Phil. Jour. Sci. (1907), 2, sec. A, 329 

 (Bohol). 



Hyloterpe apoensis basilanica MEARNS, Proc. U. S. Nat. Mus. (1909), 36, 

 442.* 



Pbe'a-oi-toi, Bagobo of Mount Apo. 



Basilan (Steere Exp., Bourns d Worcester, McGregor, Mearns) ; Bohol (Mc- 

 Gregor) ; Dinagat (Everett) ; Leyte ( Whitehead) ; Mindanao (Bourns d Worcester, 

 Mearns, Good fellow, Celestino) ; Samar (Steere Exp., Bourns & Worcester, White- 

 head) ; Siquijor (Steere Exp., Bourns d Worcester, Celestino). 



Adult. Similar to 77. philippinensis , but the bill decidedly smaller 

 and the back bright olive-green. A male topotype measures : Wing, S2 ; 

 tail, 68 ; culmen from base, 14 ; bill from nostril, 9 ; tarsus, 18.5. Speci- 

 mens 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 



* "Adult male. Similar to typical Hyloterpe apoensis, but paler throughout, 

 with crown brownish instead of grayish; under parts canary-yellow instead of 

 lemon-yellow; slightly smaller. Wing, 78; tail, 67; culmen, 14; bill from 

 nostril, 9.2; tarsus, 17.5. 'Iris brown. Bill black/ 



"Adult female * * *. Paler and dingier than the male; under parts pale 

 canary-yellow from throat backward. Wing, 71; tail, 61; tarsus, 17.5. 



"Remarks. Specimens in the U. S. National Museum, collected on the Island 

 of Siquijor, Philippine Islands, by F. S. Bourns and D. C. Worcester, are exactly 

 like Basilan specimens taken in February, 1888, and must be included as belonging 

 to this species. Lowland birds from Mindanao Island connect the forms apoensis 

 and basilanica." (Mearns.) 



Specimens from Siquijor, although larger than true H. apoensis, seem to be 

 nearly like this species in color. 



