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. 



l'Hylochare à 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, 3èin. Wing, 2\. 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. 



l'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. 



l'Hylocare de Bartlett. 



Habitat. — Peru. 



