242 Genera of Humming Birds. 



Genus XCVII. Erebenna, Muls. and Verr., Class. Troch., 



1865, p. 66. 

 Type : T. dcrbyi, Delattre and Bourcier. 



Bill straight, longer than the head, rather stout for all its 

 length. Nostrils exposed. Wings long, narrow, and pointed, 

 reaching the end of tail. Tail forked and acutely pointed. 

 Tarsi clothed. Sexes dissirriilar. 



Habitat. — Colombia and Ecuador. 



342. Erebenna DERBIANA, Delatt. and Bourc, Rev. Zool., 



1846, p. 306. 



Eriopiis derbyi, Gould, P.Z.S., 1847, p. 17. 



Threptria derbyi, Reich., Aufz. der Col., 1859, p. 3. 



Eriocnernis derby anus, Bon., Rev. and Mag. Zool., 1854, 

 p. 252. 



Derby's Puff-leg, Gould, Mon. Troch., vol. iv., p. 279. 



r Eriocnemis de Derby, Muls., Hist. Nat. Ois. Mou., 1876, 

 t. iii., p. 60. 



Habitat. — Colombia and Ecuador. 



Male. — Upperside shining golden-green, bronzy on neck 

 and uppertail-coverts. Uppertail-coverts luminous metallic 

 gold. Tail brownish-black, with a bronze tinge on base of 

 feathers. Underside brilliant golden-green. Undertail-coverts 

 luminous golden-green. Tarsal tufts black. Wings purplish- 

 brown. Feet and bill black. 



Total length, 3fin. Wing, 2f. Tail. \\. Culmen, f. 



Female. — Forehead shining greenish-blue. Upperside 

 shining green, bronzy on neck and rump. Underside metallic 

 golden-green, showing the white base of feathers on the 

 throat and breast, and more so, on centre of abdomen. Tarsal 

 tufts white. Rest as male. 



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



This excessively rare and line species was discovered on 

 the volcano of Purace, near Popayan, by Delattre. It was 

 dedicated by him and Bourcier, to Lord Edward, thirteenth 

 Earl of Derby, who during his lifetime, was one of the most 

 liberal Patrons of natural sciences. 



My female specimen of this species was collected at Pasto, 

 by the celebrated alpinist, Mr. E. Whymper. 



