Genera of Humming Birds. 145 



Thaumatias cyaneus, Bon., Consp. Gen. Av., 1850, vol. i., 

 p. 78. 



White-throated Sapphire, Gould, Mon. Troch., vol. 5, p. 344. 



I' Hylochare a front bleu, Muls., Hist. Nat. Ois. Mou., 1875, 

 t. ii., p. 20. 



Habitat. — Brazil. 



Male. — Head, throat and breast shining dark blue. Upper- 

 side bronzy-green passing into reddish-bronze on rump. Upper- 

 tail-coverts dark reddish-bronze. Underside green with gray 

 tinge. A tuft of white feathers on each side of the anal 

 region. Undertail-coverts bluish-black with grayish or bronzy 

 edges. Tail blue-black. Wings purple. Bill flesh colour 

 with black tips. 



Total length, 3-Un. Wing, 25. Tail, \\. Culmen, |-. 



Female. — Upperside like that of male, dark green on fore- 

 head. Underside grayish-white tinged with green on sides 

 of throat and breast. Lateral rectrices tipped grayish-white. 

 Young males have the chin and breast shining pale blue. 



204. Hylocharis viridiventris, Berlepsch, Ibis, 1880, p. 1 13. 

 Green-vented Sapphire. 



I' Hylochare a ventre vert. 



Habitat. — 'Venezuela, Trinidad, British Guiana and Orinoco. 



This is a northern form of H. cyanea, from which it 

 differs in its somewhat more splendid and vivid colouration. 

 In particular, I find the belly to be never mixed with gray, as 

 in Brazilian specimens, but of a dark and splendid green 

 colour. 



205. Hylocharis bartletti, Gould, P.Z.S., 1866, p. 194. 



Agyrtria Bartletti, Elliot, Class and Syn. Troch., 1879, 

 p. 205. 



Bartlett's Emerald, Gould, Mon. Troch. Suppl., 1886, 

 p. 74. 



Le Thumatias de Bartlett, Muls., Hist. Nat. Ois. Mou., 

 1874, t. i., p. 255. 



I' Hylocare de Bartlett. 



Habitat. — Peru. 



