BIRDS OF NORTH AXD MIDDLE AMERICA. 351 



bb. Pileum and hindneck dark gray (the feathers dusky centrally) replaced abruptly 

 by white on forehead and superciliary region. (Colombia to northern Peru.) 



Copurus colonus fuscicapillus (extralimital) " 



aa. Back with a gray or grayish white median stripe. (Honduras to Cayenne and 



western Ecuador.) Copurus Isuconotus (p. 351) 



COPURUS LEUCONOTUS Lafresnaye. 

 WHITE-BACKED COPURUS. 



Adult male. — Pileum and hindneck deep sooty gray (the feathers 

 darker centrally), margined anteriorly and laterally by a rather 

 broad band of white, extending across forehead and along superciliary 

 and supra-auricular regions; median portion of back broadly streaked 

 with pale gray or grayish white ; rump grayish wliite ; rest of plumage 

 plain black, passing on posterior under parts into dark sooty grayish; 

 the center of abdomen suffused with whitish; bill and feet black; iris 

 dark brown; length (skins), 205-242 (228); wing, 68.5-77.5 (72.7), 

 tail (elongated middle rectrices), 142-174 (161.7); exposed culmen, 

 8.5-9.5 (9); tarsus, 12.5-14.5 (13.4); middle toe, 8.5-10 (9.3).^ 



Adult female . — Similar to the adult male, but slightly smaller, elon- 

 gated middle rectrices shorter, black of under parts duller, sometimes 

 more extensiyely suifused with whitish on abdomen, and color of 

 pileum ayeraging darker; length (skins), 180-212 (197); wing, 

 66.5-70.5 (67.8); tail (elongated middle rectrices), 116-142.5 (129); 

 exposed culmen, 8.5-9.5 (9.2); tarsus, 13-14 (13.4); middle toe, 

 8.5-10 (9.3).'^ 



Young. — Entirely plain sooty blackish, the under parts slightly 

 paler and grayer. 



Southern Hondiu'as (Segovia Riyer) through eastern Nicaragua 

 (Chontales; Los Sabalos; Rio Escondido), eastern and central Costa 

 Rica (Rio Frio; Talamanca; Jiminez; Pacuare; Tucurriqui; Tur- 

 rialba; Carrillo; Bonilla; San Jose), Panama (Santa Fe; Paraiso; 

 Loma del Leon; Panama), Colombia (Bogota; Remedies; RioGaupi; 

 Bucaramanga) to western Ecuador (Esmeraldas; Pambilar; Foreste 

 del Rio Peripa) and Cayenne. 



O' Co pur us fuscicapillus Sclater, Proc. Zool. Soc. Lond., 1861, 381 (Bogota, Colombia; 

 coll. P. L. Sclater); Cat. Am. Birds, 1862, 204. — Copurus colonus (not Muscicapa 

 colonus Vieillot) Sclater, Cat. Birds Brit. Mus., xiv, 1888, 50, part. — Copurus colonus 

 fuscicapillus Berlepscli and Stolzmann, Proc. Zool. Soc. Lond., 1896, 357 (La Merced 

 and La Gloria, Peru; crit.). 



Judging from the material examined tins seems in be a perfectly good form, the tlif- 

 ferences presented l)eing strictly geographical. 



6 Nine specimens. 



c Ten specimens. 



