BIRDS OF NORTH AND MIDDLE AMERICA 57 



broad, rounded, distinctly outlined, except on rump and anal region, 

 where soft, downy, and blended. Coloration plain blackish or sooty above, 

 more or less glossed with greenish, dusky or sooty below, in one species 

 with under parts of body cinnamon-rufous ; sexes alike. 



Range. — Costa Rica to Peru. (Two species, only one in the area 

 covered by this work.) 



CHAMAEPETES UNICOLOR Salvin 



Black Guan 



Adult (sexes alike). — Entire feathered areas of head, neck, upper- 

 parts, wings, and tail black with a strong, dark greenish blue sheen, the 

 primaries with little if any sheen, and washed with fuscous ; upper breast, 

 thighs, and flanks like the upperparts but less glossy, mixed with grayish ; 

 lower breast, abdomen, and under tail coverts chaetura drab to fuscous 

 washed to a varying degree with dark grayish olive to olivaceous-black, 

 the olivaceous feathers with a slight oily gloss; the feathers of the lower 

 midabdomen more downy in texture and without any olivaceous wash — 

 fuscous to clove brown ; under wing coverts like the upperparts ; "bare 

 skin of nasal (cere) and frontal areas azure blue shading to ultramarine 

 near the eyes ; skin of basal region of lower mandible azure blue shading 

 to ultramarine farther back ; iris wine purple ; tarsus burnt carmine 

 "(W. W. Brown on label of M.C.Z. No. 118923)." 



Immature. — No specimen or description seen, but Carriker (Ann. 

 Carnegie Mus., iv, 1908, 385) writes that several young birds taken on 

 Volcan Turrialba, Costa Rica, and not saved, had the feathers of the lower 

 parts edged with rufous, which "even persists after the upperparts have 

 assumed the adult plumage." Apparently no one has published anything 

 on any but the adult plumage. 



Adult male.—Wmg 285-298 (290) ; tail 295-303 (293.6) ; culmen 

 from base of cere 30.5-33 (31.9) ; tarsus 63.7-76.5 (71.7) ; middle toe 

 without claw 5156.5 (54.4 mm.).^^ 



Adult female. — Wing 264; tail 287; culmen from base of cere 33.2; 

 tarsus 69.6; middle toe without claw 52.1 mm. (1 specimen, Costa Rica). 



Range. — Resident in the subtropical zone in the mountains of Costa 

 Rica (La Palma de San Jose, Rancho Redondo, Volcan de Irazu, Volcan 

 de Turrialba, Varra Blanca de Sarapiqui, and Ujurras de Terraba) and 

 western Panama (Calovevora, Veraguas; Cordillera de Tole; and 

 Boquete, Chiriqui, 5,600-5,800 feet). 



Type locality. — Veraguas, Panama. 



Chamcepetes unicolor Salvin, Proc. Zool. Soc. London, 1867, 159, 160 (Calovevora, 

 Veraguas, w. Panama; coll. Salvin and Godman, now in coll. Brit. AIus.) ; 1870, 

 217 (Calovevora, Veraguas). — Lawrence, Ann. Lye. Nat. Hist. New York, ix, 



Five specimens from Panama and Costa Rica. 



