764 BULLETIN 50, UNILED STATES NATIONAL MUSEUM. 
d, Middle rectrices bronze-green or greenish bronze. (Tropical South America.) 
Trogonurus curucui curucui, and other subspecies (extralimital).¢ 
dd. Middle rectrices metallic pure green, bluish green, or greenish blue; 
lateral rectrices more broadly barred. (Southern Honduras to Panam.) 
Trogonurus curucui tenellus, adult male (p. 781). 
aa. Head, chest, and upper parts brownish (without metallic coloring), the middle 
pair of rectrices more rufescent. (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 ambiguus.) 
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). 
ce. 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. 
@ 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 asa whole: [Trogon] curucut 
Linnzus, Syst. Nat., ed. 12, i, 1766, 167 (based essentially on Yellow-bellied Green 
Cuckow Edwards, Gleanings Nat. Hist., iii, 256, pl. 331).—[ Trogon curucut] 7. Gmelin, 
Syst. Nat., i, pt. 1, 1788, 403.—[ Trogon] rufus Gmelin, Syst. Nat., i, pt. 1, 1788, 404 
(Cayenne; based on Couroucou & queue rousse de Cayenne Buffon, Hist. Nat. Ois., vi, 
293; Pl. Enl., pl. 736; = adult female).—Trogon atricollis Vieillot, Nouv. Dict. 
d’Hist. Nat., viii, 1817, 318 (Guiana; Suriném; etc.); Gal. Ois., i, 1825, 17, pl. 31, 
Gould, Mon. Trog., ed. 1, 1838, pl. 8, and text; ed. 2, 1875, pl. 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, pl. 38, figs. 1, 2 (Tabatinga, Brazil).— Trogon chrysochloros Pelzeln, Sitz. Ak. Wien, 
xx, 1856, 496, 505 (Ypanema Brazil).— Trogon atricollis chrysochlorus Berlepsch and 
Thering, Zeitschr. Orn., 1885, 160.—?A[ganus] devillet Cabanis and Heine, Mus. Hein., 
v, Feb., 1863, 191, footnote (Santa Maria, upper Amazon). 
In adopting as the earliest name for this species Trogon curucui Linnzus, 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 7. collaris Vieillot. It is true that Linnzeus’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 7’. 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 aitricollis 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.” 
