764 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



d. Middle rectrices bronze-green or greenish bronze. (Tropical South America.) 

 Trogonurus curucui curucui, and other subspecies (extralimital).a 

 dd. Middle rectrices metallic pure green, bluish green, or greenish blue; 

 lateral rectrices more broadly barred. (Southern Honduras to Panami,.) 

 Trogonurus curucui tenellus, adult male (p. 781). 

 aa. Head, chest, and upper parts brownish (without metallic coloring), the middle 

 pair of rectrices more rvifescent. (Adult females .) 

 b. A conspicuous auricular spot of dull white; lower breast white, 

 c. Lateral rectrices very irregularly barred or mottled with grayish dusky. 

 {Trogonurus ambigims.) 

 d. Darker and browner above and on chest, the middle rectrices cinnamon- 

 rufous or light chestnut; red of posterior under parts deeper. 



Trogonurus ambiguus ambiguus, adult female (p. 768). 

 dd. Paler and grayer above and on chest, the middle rectrices cinnamon; red 

 of posterior under parts paler. 



Trogonurus ambiguus goldmani, adult female (p. 772). 

 cc. Lateral rectrices regularly barred with grayish black. 



Trogonurus elegans, adult female (p. 773). 

 bb. No white auricular spot; lower breast not white, 

 c. Posterior under parts red or orange. 

 d. Posterior under parts red. 

 e. Breast brown (paler and sometimes more grayish posteriorly), with an 

 imperfectly developed white band across anterior margin; lateral rec- 

 trices broadly barred with white on outer web. 



Trogonurus mexicanus, adult female (p. 765), 

 ee. Breast red (like abdomen, etc.) bordered anteriorly by a conspicuous 

 band of white. 



a There are, apparently, at least four definable South American forms of this species; 

 but as both material and time are lacking for properly working them out, I can here 

 only cite the various names which are applicable to them as a whole: [ Trogon] curucui 

 Linnaeus, Syst. Nat., ed. 12, i, 1766, 167 (based essentially on Yellow-bellied Green 

 Cuckow Edwards, Gleanings Nat. Hist., iii, 256, pi. 331). — [Trogon curucui] y. Gmelin, 

 Syst. Nat., i, pt. 1, 1788, mz.— {Trogon] ni/us Gmelin, Syst. Nat., i, pt. 1, 1788, 404 

 (Cayenne; based on Couroucou a queue rousse de Cayenne Buffon, Hist. Nat. Ois., vi, 

 293; PI. Enl., pi. 736; = adult female).— Trogrow atricollis Vieillot, Nouv. Diet. 

 d'Hist. Nat., viii, 1817, 318 (Guiana; Surinam; etc.); Gal. Ois., i, 1825, 17, pi. 31; 

 Gould, Mon. Trog., ed. 1, 1838, pi. 8, and text; ed. 2, 1875, pi. 14 and text; Grant,' 

 Cat. Birds Brit. Mus., xvii, 1892, 455, part. — P[othinus] atricollis Cabanis and Heine, 

 Mus. Hein., iv, Feb., 1863, 180 (Brazil). — Trogon lepturus Swainson, Anim. in Menag., 

 pt. iii, Jan. 1, 1838, 331 (Cayenne). — Trogon sulphureus Spix, Av. Bras., i, 1824-1826, 

 48, pi. 38, figs. 1, 2 (Tabatinga, Brazil). — Trogon chrysochloros Pelzeln, Sitz. Ak. Wien, 

 XX, 1856, 496, 505 (Ypanema Brazil).— Trog'on atricollis chrysochlorus Berlepsch and 

 Ihering, Zeitschr. Orn., 1885, 160.— ?A[ganus] devillei Cahanis and Heine, Mus. Heia., 

 v, Feb., 1863, 191, footnote (Santa Maria, upper Amazon). 



In adopting as the earliest name for this species Trogon curucui Linnseus, I am 

 conscious of the fact that Mr. Hellmayr, for whose determinations I have the greatest 

 respect, has reached a different conclusion by identifying the name in question 

 with T. collaris Vieillot. It is true that Linnoeus's T. curucui, a composite species, 

 includes T. collaris as well as the present species, and that the majority of the refer- 

 ences cited belong to T. collaris; but the diagnosis is evidently based solely on the 

 Yellow-bellied Green Cuckow of Edwards, which is unquestionably the species 

 generally known as Trogon atricollis Vieillot, the phrase "subtus fulvus," instead 

 of being an erroneous translation, being, to my mind, intended to describe the color 

 as represented on Edwards's plate, or, possibly, a slip or misprint for "subtus flavus." 



