Genera of Humming Birds. 151 



Male. — This species is very much like the preceding one. 

 The only difference which 1 can perceive is its larger size, and 

 the centre of breast which is white. 



Total length, 3fin. Wing, 2\. Tail, if. Culmen, 1. 



*2i5. Agyrtria MACULICAUDA, Gould, Int. Troch., i86i r 



P- J 54- 



Guiana Emerald, Gould, Mon. Troch., Suppl., 1886, p. 77. 



LeThaumatias â queue tachée, Muls., Hist., Nat. Ois., Mou., 

 1874, t. i., p. 251. 



Habitat. — Guiana. 



Male. — This is a very small species with a long thin 

 bill, its breast is green as in the others. Centre of the abdomen 

 white ; undertail-coverts white except in the centre, where 

 they are dark brown ; two central tail feathers bronzy-green, 

 except at the extreme tip, which is greenish-black, the next 

 one on each side, bronze for half its length, then black, the 

 three outer ones, on each side, bronzy-green at base, then 

 broadly zoned with black, next to which, they are green, and 

 lastly white. 



Total length, 3Jin. Bill,|. Wing, 2. Tail. ij. " Gould, loc. cit." 



216. Agyrtria nigricauda, Elliot, Ibis, 1878, p. 47. 



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

 p. 80. 



Le Thaumatias à queue noire. 



Habitat. — Trinidad, Guiana, Brazil. 



Male. — Upperside bronzy-green, darkest on the head, and 

 shading into purple on the uppertail-coverts. Tail steel-black 

 excepting the median rectrices which are purplish-bronze at 

 base, the two outermost feathers are greenish-gray at tips. 

 Throat and breast shining metallic grass-green. Flanks dark 

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

 Wings purple. Maxilla black. Mandible flesh colour, with 

 black tip. 



Total length, 3Jin. Wing, 2\. Tail, i^. Culmen, f. 



I have some specimens of this species from Brazil and 

 Trinidad, in which the median rectrices, and the one next ta 

 them are purplish-bronze with blackish tips. 



