Genera of Humming Birds. 137 



Male. — Upperside shining bronzy-green. Median rectrices 

 shining bronze-green, next bronze-green with black tip, 

 remaining lateral feathers bronze-green at base, rest purplish 

 black, with a very slight gray margin at tips. Throat and 

 breast shining green. Abdomen and undertail-coverts white. 

 Flanks white, washed with green feathers. Wings purple- 

 brown. Maxilla black. Mandible flesh colour, with black tip. 



Total length, 4in. Wing, 2. Tail, ly^. Culmen, ^. 



Female. — Differs only from the male by the underside, which 

 is grayish-white, washed with green feathers on sides of neck, 

 breast and flanks, and the lateral feathers of tail, which are 

 slightly tipped gray. Size same as male. 



Types in my collection. 



I discovered this new genus, and new species in May 1877, 

 at Punta Arenas (Costa Rica), during the two days that I had 

 to wait for the steamer, in which I was pursuing my voyage to 

 Guatemala. They were searching for food in some flowers of 

 a species of Magnolia, and I consider that I was very fortunate, 

 because, although I collected some great rarities in birds 

 during my stay in Costa Rica, this was the only new species 

 of Humming Bird which I found, with the exception of 

 Oreopyra pectoralis, Salv., which at that time we thought to 

 be the same as O. calolaema, but in fact, I was the discoverer 

 of that species also. 



Genus LXII. Chrysuronia, Bon. Consp. Gen. Av., 1850, 



vol. i., p. 75. 

 Chrysuriis, Bon. Compt. Rendus. 1850. p. 382. 

 Chrysurisca, Cab. and Hein., Mus. Hein., i860, t. iii. p. 42. 

 Type : O. Aenone, Lesson. 



Bill slightly longer than the head, broad at base, and rather 

 flat, graduating rapidly to a sharp point. Nostrils exposed. 

 Wings long, reaching the end of tail. Tail forked in some 

 species, in others slightly rounded. Rectrices narrow. Feet 

 large. Tarsi clothed. Sexes unlike. 



Habitat. — Central America to Argentine Republic. 



191. Chrysuronia aenone, Less, Ois. Mou, Suppl., p. 157. 



Polytmus aenofie, Gray, Gen. Birds, vol. i., p. 109. 



Chrysurisca aenone, Cab. and Hein., Mus. Hein., i860, t. iii., 

 p. 42. 



