1918. CATALOGUE OF BIRDS OF THE AMERICAS CORY. 179 



*Agyrtrina Candida (Bourc. and Muls.). WHITE-BELLIED EMERALD. 

 Trochilus candidus BOURCIER and MULSANT, Ann. Phys. et Nat., IX, 1846, p. 326 



(Coban, Guatemala). 



Thaumatias candidus GOULD, Mon. Trochil., V, 1860, pi. 292. 

 Agyrtria Candida SALVIN, Cat. Bds. Brit. Mus., XVI, 1892, pp. 190, 660; RIDG- 



WAY, Bull. U. S. Nat. Mus., No. 50, V, 1911, p. 432. 



Range: Southeastern Mexico to Costa Rica. 

 6: Guatemala 5; "Mexico" i. 



Agyrtrina tephrocephala ( VieilL). BRAZILIAN EMERALD. 



Trochilus tephrocephalus VIEILLOT, Nov. Diet. d'Hist. Nat., XXIII, 1818, p. 430 



(Brazil). 



Thaumatias albiventris GOULD, Mon. Trochil., X, 1856, pi. 301. 

 Agyrtria tephrocephala ELLIOT, Syn. Trochil., 1879, p. 206. 



Range: Brazil. 

 4: British Guiana. 



Genus POLYERATA Heine. 



Polyerata Heine, Journ. fur Ornith., 1863, p. 194, in text (Type Trochilus amabili 

 Gould). 



*Polyerata amabilis (Gould). BLUE-BREASTED HUMMING BIRD. 



Trochilus amabilis GOULD, Proc. Zool. Soc. Lond., 1851, p. 115 (" New Grenada" 



= Colombia). 

 Damophila amabilis GOULD, Mon. Trochil., V, 1859, pi. 341; ELLIOT, Syn. 



Trochil., 1879, p. 234. 

 Polyerata amabilis SALVIN, Cat. Bds. Brit. Mus., XVI, 1892, p. 237; RIDGWAY, 



Bull. U. S. Nat. Mus., No. 50, V, 1911, p. 523; CHAPMAN, Bull. Am. Mus. 



N. H., XXXVI, 1917, p. 286 (Puerto Valdivia; Alto Bonito, Colombia and 



Esmeraldas, Ecuador). 



Range: Eastern Nicaragua, Costa Rica, Panama, Colombia and 

 northern and western Ecuador. 



10: Colombia (Bouqueron 2, "Colombia" 5, Bogota i); and 

 Panama 2. 



*Polyerata rosenbergi (Boucard)* ROSENBERG'S HUMMING BIRD. 



Polyerata rosenbergi BOUCARD, Gen. Humming Bds., 1895, p. 399 (Rio Dagua, 

 western Colombia) ; HELLMAYR, Proc. Zool. Soc. Lond., 1911, p. 1181 (western 

 Colombia); CHAPMAN, Bull. Am. Mus. N. H., XXXVI, 1917, p. 287 (western 

 Colombia, numerous localities). 



Polyerata rosenbergi BOUCARD: Upper parts dark bronze green; median rectrices 

 bronze green; lateral rectrices bronze green at base, then bluish black, the outermost 

 one bluish black; chin and throat metallic emerald green; breast metallic blue with 

 a purplish tinge; abdomen dark sooty gray with a bar of metallic green, feathers 

 separating the blue of the breast from the gray of the abdomen; under tail coverts 

 white; upper mandible black, lower mandible flesh color (in life) with black tip. 

 Wing, about 56; bill, 19 mm. 



