416 BIRDS OF BRITISH GUIANA. 



portion of the outer webs white, as are also the tips ; flight- 

 feathers brown ; vent anj under tail-coverts white. 



Total length 105 mm., culmen 22, wing 60, tail 39. 

 The male described was collected on the Abarj River in 

 September 1907. 



Adult female. Similar to the adult male, but differs in being 

 not so bright; the abdomen for the most part white, and slightly 

 smaller in size. AVing 54 mm. 



Immature male. Differs from the adult in being duller above 

 and pale rufous on the under surface, with a line of glittering- 

 green feathers down the middle of the throat. 



Immature female. Is also duller on the upper sui-face, and 

 uniform dark rufous below. 



The descriptions of the adult female and immature birds are 

 taken from specimens in the British Museum collected by Whitely 

 at Mount Roraima in December, January, and June — Sulvin- 

 Godman collection. 



Breeding -season. Unknown in British Guiana. 



Nest. Unrecorded in British Guiana. 



Eggs. Undescribed from British Guiana. 



Range in British Guiana. Mount Roraima, Abary River 

 (McConnell collection) ; Mount Roraima, 3500 ft., Annai 

 {miiteh/) ; Takutu (ScJwmhurgk) ; Georgetown {Qnelch). 



Extralimital Range. Trinidad^ Venezuela, Colombia. 



HaUts. Schomburgk states (Reis. Guian. iii. p. 707) that he 

 obtained this species once near Takutu, where it was rare. The 

 female is slightly duller than the male, and the young males are 

 like the females. The " Macusis " call it Komariuhi. 



Mr. J. J. Quelch, who observed this bird at Georgetown, 

 remarks (Timehri (2) v. p. 100):— "The White-tailed Golden- 

 throat (^Chrgsohronchus virescens) is to be met with, though not 

 commonlv, on the outskirts of the town." 



Genus TOPAZ A Gray. 



Tojmza Gray, List aen. B. p. 1.3, 1840. Type T. pella (Linn.). 



This genus is easily distinguished by the peculiar form of the 

 tail, two of the siibniodian feathers being much elongated and 

 crossino- fach other. 



