BIRDS OF NORTH AND MIDDLE AMERICA. 759 
TROGON MELANOCEPHALUS ILLATABILIS Bangs. 
SLATY-HEADED TROGON. 
Similar to 7. m. melanocephalus, but head, neck, and chest more 
slaty, the chest often slate-gray in adult female; slightly larger. 
Adult male-—Length (skins), 260-288 (268); wing, 132.5-148.5 
(143.8); tail, 143.5-158.5 (151.9); culmen, 19.5-23.5 (21.2); tarsus, 
13.5-15 (14.5); inner anterior toe, 14-15 (14.5).2 
Adult female.—Length (skins), 255-267 (259); wing, 140-150.5 
(144.3); tail, 142.5-156 (148.8); culmen, 19.5-22 (20.5); tarsus, 
13.5-15 (14.2); middle toe, 14-15.5 (14.6).° 
Western Costa Rica (Bolsén; Bebedero; Barranca de Punta 
Arenas; Tenério; Volcén de Miravalles) and western Nicaragua 
(Sucuyé; Realejo; Managua; Omotepe; San Gerénimo, Chinandega; 
Grenada). 
Trogon melanocephalus (not of Gould} Nurtina, Proc. U. 8. Nat. Mus., v, 1882, 
400 (La Palma de Nicoya, w. Costa Rica; habits); vi, 1883, 376, 387, 395 
(San Juan del Sur, Sucuy4, and Omotepe, Nicaragua).—Grant, Cat. Birds 
Brit. Mus., xvii, 1892, 462, part (Virgin Bay and Volc4n de Chinandega, w. 
Nicaragua; Costa Rica?).—Satvin and Gopman, Biol. Centr.-Am., Aves, ii, 
1896, 498, part (San Juan del Sur, Sucuy4, Omotepe, Virgin Bay, and Volc4n 
de Chinandega, w. Nicaragua; La Palma de Nicoya, w. Costa Rica).— 
UnvERWwooD, Ibis, 1896, 444 (Volc4n de Miravalles and Bagaces, n. w. Costa 
Rica).—(?)ALFARO, Paginas Illustradas, i, 1904, 530, 531 (Costa Rica; nesting 
habits; fig. of nest).—Banas, Auk, xxiv, 1907, 294 (Barranca de Punta Arenas, 
w. Costa Rica). 
(?) Z[rogon] melano-cephalus Lawrence, Ann. Lyc. N. Y., ix, 1868, 120, in text 
(Costa Rica). : 
Trogon melanocephalus illaetabilis Banas, Proc. Biol. Soc. Wash., xxii, March 10, 
1909, 30 (Bolsén, w. Costa Rica; coll. E. A. and O. Bangs).—Carrixer, 
Ann. Carnegie Mus., vi, 1910, 560 (Nicoya peninsula and s. Guanacaste, 
w. Costa Rica. 
TROGON CITREOLUS Gould. 
CITREOLINE TROGON. 
Adult male——Pileum, hindneck, and sides of head and neck 
blackish slate, passing gradually into slate color on chin, throat, and 
chest; back and scapulars metallic golden green, passing into metallic 
bluish green or greenish blue (sometimes tinged with violet-blue) on 
rump and upper tail-coverts, the extreme upper portion of back 
sometimes bluish green; middle pair of rectrices metallic green or 
bronze-green, abruptly and rather narrowly tipped with black, the 
outer web of next two pairs similar but inner web wholly black; 
three outer pairs black basally, extensively white terminally, the 
white on outermost rectrix occupying about half of inner web and 
all but basal portion of outer web, that on the third (from outside) 
about terminal third of outer and fourth of inner web; wing-coverts 
@ Seventeen specimens. + Ten specimens, from western Costa Rica. 
