164 GENERA AND SPECIES. 



of a deep violet-blue ; a semilunar mark of white 

 crosses the top of the back ; the upper surface 

 generally is golden green ; the abdomen snowy- 

 white; the tail is white, each feather being 

 neatly edged at the tip with dusky black ; the 

 upper tail-coverts extend to the edge of the tail. 



The female is very unlike the male. The top 

 of the head is bronzy-green, and the throat dusky 

 white, with darker spots ; the tail is bronzy- 

 green, each feather being edged narrowly at the 

 tip with white. General plumage, dull. 



The young males resemble the female, except 

 that the head and throat assume a tint of pale 

 violet, or rather plum colour. 



Locality : Tobago. 



Trochilus ater. Head, chest, top of back, and 

 abdomen velvety black; flanks and thigh-feathers 

 white ; tail white, tipped with black ; the two 

 central tail-feathers being of a dull purplish- 

 brown, washed with glossy green ; rump and 

 upper tail-coverts black, washed with glossy 

 golden green. 



Locality: Brazil. 



Genus HYLOCHABIS, Boie (Les Saphirs, Les- 

 son, Smaragdites, Boie). Of this genus the 

 Sapphire-throated Humming-bird ( Trochilus sap- 

 pJtirinus), and the Golden-green Humming-bird 

 (Ornismya prasima, Less.), are examples. The 

 former is described and figured in the Natural- 

 ist's Lib. Ornith. vol. i. p. 135, pi. 28. It is a 

 native of Guiana, Cayenne, Brazil, and Berbice. 



