GENERA AND SPECIES. 217 



The forehead and gorget are changeable 

 emerald and bronze, of effulgent lustre. The 

 under surface of the tail glistens with a golden 

 radiance ; upper and under surface bronzy green. 



The female wants the black on the top of the 

 head ; the side line of the gorget is dusky 



Locality : Brazil. Bahia. In Gould's cabinet. 



G-enus CALOTHOBAX, Gray. (Les Lucifers, 

 Lesson.) 



In this genus the beak is long, slender, and 

 gently arched ; the wings are moderate ; the 

 tail is singularly bifid in the male ; the outer 

 tail-feather on each side is short and slender, 

 the two next much longer and pointed, and the 

 central much shorter; the gorget is ample, 

 magnificent, free, and pointed at the sides. 



The female is plain, without a distinct gorget ; 

 the tail is rounded, its outer feathers being 

 tipped with white or brown. 



To this genus belongs the Trochilus Lucifer, 

 Swainson. (Ornismya Cyanopogon, Lesson), de- 

 scribed and figured in the Naturalist's Library, 

 as the Blue-throated Humming-bird, vol. ii. 

 p. 79, pi. 14. In Gould's cabinet. 



Another, but abnormal species, perhaps to be 

 transferred to the genus Tryphcena, is the Tro- 

 chilus enicurus of Vieillot. This bird is described 

 and figured in the Naturalist's Lib. Ornith. 

 vol. i. p. 133, pi. 27. It is certainly not one 

 of the genus Calothorax. In Gould's cabinet. 



