1^2 Genera of Humming Birds. 



217. Agyrtria niticauda, Elliot, Ibis, 1878, p. 48. 

 Bright-tailed Emerald, Gould, Mon. Troch., Suppl., 1886, 



p. 80. 



Thaumatias niticanda, Muls., Hist. Nat. Ois. Mou., 1878, 

 t. iv., p. 177. 



le Thaumatias à quene brillante. 



Habitat. — Guiana. 



Male. — Upperside bronze-green, with a slight coppery 

 tinge on the head. Chin white. Throat, breast, and sides of 

 neck bright metallic green. Flanks and abdomen bronze- 

 green. Middle of abdomen, vent, and undertail-coverts white. 

 Median rectrices bronze-green, lateral purplish-black, edges 

 and tips of outermost bronze green. Wings purplish-brown. 

 Bill flesh colour with dark tips. 



Total length, 3^in. Wing, 2\. Tail, \\. Bill, f. 



Type in the Museum of New York " Ex. Elliot's Coll." 



By the description and my specimens, which agrees with it, 

 and were collected by Whitely in Guiana, I should not be 

 surprised if this species, and A. maculicauda, Gould, turn out 

 to be only the well known species A. tobaci. 



218. Agyrtria fluviatilis, Gould, Int. Troch, 1861, p. 154. 

 Riverine Emerald, Gould, Mon. Troch., Suppl., 1886, p. 76. 



Le Thaumatias fluviatile, Muls., Hist. Nat. Ois. Mou., 1874, 

 t. i., p. 254. 



Habitat. — Pelas (Peru.) 



Male. — Upperside shining golden-green. Median rectrices 

 bronze-green largely tipped with bluish-black, lateral bronze 

 at base of external web, then bluish-black, the two outer- 

 most ones bluish-black, with a very slight gray margin at 

 tips. Throat and breast luminous grass-green. Abdomen 

 and flanks shining greenish-bronze. Vent white. Under- 

 tail-coverts pale green, edged with gray. Wings purple. 

 Bill flesh colour with black tips. 



Total length, 3fin. Wing, 2\. Tail, if. Culmen, |. 



Female. — Upperside shining grass-green, bronzy on fore- 

 head and uppertail-coverts. Median rectrices, bronze-green, 

 lateral bronze-green on external webs, then bluish-black, 

 margined white at tips, outermost one bluish-black with 



