58 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



1868, 139 (La Paltna de San Jose and Rancho Redondo, Costa Rica).— Sclater 

 and Salvin, Proc. Zool. Soc. London, 1870, 531 (monogr.).— Boucard, Proc. 

 Zool. Soc. London, 1878, 42 (Volcan de Irazu, Costa Rica).— Zeledon, Cat. 

 Aves Costa Rica, 1882, 28; Anal. Mus. Nac. Costa Rica, i, 1887, 128 (Rancho 

 Redondo, Costa Rica). — Ogilvie-Grant, Cat. Birds Brit. Mus., xxii, 1893, 522 

 (San Jose and Volcan de Irazii, Costa Rica; Calovevora and Cordillera de Tole, 

 w. Panama) ; Handb. Game Birds, ii, 1897, 257 (monogr.).— Bangs, Proc. New 

 England Zool. Qub, iii, 1902, 22 (Boquete, 5,600-5,800 feet, Chiriqui, w. Pan- 

 ama). — Salvin and Godman, Biol. Centr.-Amer., Aves, iii, 1902, 278, pi. 71 

 (Volcan de Irazii, San Jose, La Palma de San Jose, and Rancho Redondo, 

 Costa Rica; Calovevora and Cordillera de Tole, w. Panama). — Ferry, Publ. 

 Field Mus. Nat. Hist., No. 146, 1910, 260 (Volcan de Turrialba, Costa Rica; 

 habits).— Carkiker, Ann. Carnegie Mus., vi, 1910, 384 (Varra Blanca de Sara- 

 piqui, Volcan de Turrialba at 8,000-9,000 feet, and Ujurras de Terraba, Costa 

 Rica, crit. ; habits). 



Chlamaepetes] unicolor Reichenow, Die Vogel, i, 1913, 277. 



[ChcmKEpetes] unicolor Sclater and Salvin, Proc. Zool. Soc. London, 1870, 543; 

 Nom. Av. Neotr., 1873, 136.— Sharpe, Hand-list, i, 1899, 18. 



Chamaepetes unicolor Frantzius, Journ. fur Orn., 1869, 372 (Costa Rica). — Ken- 

 NAED and Peters, Proc. Boston Soc. Nat. Hist., 'xxxviii, 1928, 446 (Boquete 

 Trail, Panama; spec; common; plum.). — Peters, Check-list Birds of World, 

 ii, 1934, 22. — Griscom, Bull. Mus. Comp. Zool., Ixxviii, 1935, 303 (subtropical, 

 zone, mountains of Costa Rica and w. Panama). — Hellmayr and Conover, 

 Cat. Birds Amer., i, No. 1, 1942, 184 (syn.; distr.). 



[Ortalida] unicolor Gray, Hand-list, ii, 1870, 253, No. 9521 (Veraguas). 



Genus OREOPHASIS Gray 



Oreophasis Gray, Gen. Birds, iii, 1844, 485. (Type, by monotypy, 0. derbianus 



Gray.) 

 Oreophasianus (emendation) Schlegel, Handl. Dierk., i, 1857, 387. 



Rather large Cracidae (length about 812-915 mm.) with an upright, 

 nearly cylindrical, nude bony tubercle or casque springing from center 

 of the nude vertex; cere, mesorhinium, forehead, chin, and malar 

 region densely covered with velvety or plushlike feathers, those on 

 mesorhinium longer and erect, especially anteriorly; orbital region 

 and posterior portion of lores more or less covered by short feathers; 

 vertex nude, with a conspicuous erect bony, nearly cylindrical, nude 

 tubercle or casque, inclined backward at a decided angle; feathers 

 of occiput, hindneck, and sides of neck distinctly outlined, sublanceolate, 

 but with obtuse or rounded tips. Wing rather large, very broad, the 

 longest primaries extending slightly but decidedly beyond tips of longest 

 secondaries; fifth primary longest, the first (outermost) a little less 

 than two-thirds as long and distinctly bowed or bent inward. Tail a 

 little shorter than wing, strongly rounded, the rectrices (12) broad and 

 firm, with subrounded tips. Tarsus about one-fourth as long as wing, 

 stout; acrotarsium with a single series of about 12 large, transverse 

 scutella, the three uppermost covered by the rather elongated feathers 

 of thigh; planta tarsi covered on both sides by rather small, irregular. 



