BIRDS OF NORTH AND MIDDLE AMERICA 387 



LEUCOPTERNIS PRINCEPS PRINCEPS Sclater 



Prince Hawk 



Adult (sexes alike). — Entire head (except for the bare lores and cir- 

 ciimociilar areas), throat, upper breast, entire upperparts of body, 

 and upper wing coverts plumbeous-black, each feather edged with 

 slate in fresh plumage, the bases of the feathers of the crowTi and 

 occiput pure white, this color being sometimes exposed a little in 

 places; remiges blackish slate becoming whitish on the basal half of 

 the inner webs, which are barred and mottled with fuscous or grayish 

 chaetura drab, the innermost secondaries and the long scapulars 

 with broad white bars which are sometimes exposed in skins; the 

 five outer primaries somewhat sinuated, the fourth (from outside) 

 the longest, then the third, fifth, sixth, second; the first (outermost) 

 not exceeding the longest secondaries; rectrices deep black crossed by 

 a narrow white band at about the middle of their exposed portion, and 

 anterior to this by narrow and less complete bands of the same (usually 

 hidden in a dorsal view in the closed tail) ; lower breast, abdomen, 

 sides, flanks, thighs, and under tail and wing coverts white narrowly 

 barred with black; iris, dark blue, cere orange, bill leaden at tip, 

 olive basally, feet yellow. 



Young. — Unknown. 



Adtilt male.—Y^mg 364-367 (365.3); tail 210-223 (218); culmen 

 from cere 29.5-31 (30.1): tarsus 96-104 (99.3); middle toe without 

 claw 42-49 (45.3 mm).^^ 



Adult female.— \Nmg 380-388; tail 225, 225; culmen from cere 32, 

 32; tarsus 97-98; middle toe without claw 41-45 mm.^^ 



Range. — Resident, and apparently very rare, from Costa Rica 

 (Tucurriqui, La Hondura, Cariblanco de Sarapiqui) ; to Panama 

 (Boquete Trail) ; apparently a denizen of mountain forests at altitudes 

 of 4,000-5,000 feet. 



Type locality. — Costa Rica. 



Leucopternis princeps Sclater, Proc. Zool. Soc. London, 1865, 429, pi. 24 (moun- 

 tains of Costa Rica; coll. O. Salvin). — Sclater and Salvin, Exotic Orn., 

 pt. 8, 1868, 122; Nom. Av. Neotr., 1873, 119.— Lawrence, Ann. Lye. 

 Nat. Hist. New York, ix, 1868, 133 (Tucurriqui, Costa Rica). — Frantzius, 

 Journ. fur Orn., 1869, 368 (Costa Rica).— Salvin, Ibis, 1872, 243 (monogr.).— 

 RiDGWAY, U. S. Geol. and Geog. Surv. Terr., ser. 2, Bull. 2, 1876, 178 

 (monogr.); Proc. U. S. Nat. Mus., vi, 1884, 415 (Costa Rica). — Zeled6n, 

 Anal. Mus. Nac. Costa Rica, i, 1887, 126 (Costa Rica). — Gurnet, Cat. 

 Birds Prey, 1894, 25, 32; List Diurn. Birds Prey, 1884, 75.— Sharpe, Hand- 

 list, i, 1899, 259, part. — Salvin and Godman, Biol. Centr.-Amer., Aves, iii, 

 1900, 83 (Tucurriqui, Costa Rica). — Hartert, Nov. Zool., ix, 1902, 605, ir 

 part (Costa Rica; Cebago Island; crit.). — Carriker, Ann. Carnegie Mus., 

 vi, 1910, 463 (Cariblanco de Sarapiqui, La Hondura, and Tuccurriqui, 



** Three males, two females from Costa Rica and Panama. 

 839094—50 26 



