4 . ''Genera of Humming Birds. 



Total length, 360; wing, 182 ; tail, 118; culmen, 75. It 

 resembles very much to C. Annœ, less the crown patch and 

 the violet of the throat, instead of saphire. It is also distin- 

 guishable from T. Alexandri. by its larger size, broad primaries, 

 and all the peculiarities of the tail. 



Only one specimen of this species is known. It is in 

 Jeffries Collection. Mr. Jeffries says " As but one specimen 

 was procured, it might be a hybrid between T. Alexandri and 

 C. Lucifer ; but this is highly improbable, as it lacks the ruff 

 and crown patch of one, and has a different wing and tail from 

 either. It is more between T. Alexandri and C. Annœ\ but 

 it lacks the crown patch of the latter." 



I should like very much to possess one specimen of this 

 remarkable species, as by the description alone, it seems to me 

 to be only a race of Trochilus Alexandri. 



In some of my specimens of T. Alexandri the tail is similar 

 to this species. In another, kindly offered to me by the 

 authorities of Smithsonian Institution, and which was collected 

 by Mr. Henshaw, at Sonoita Valley, Arizona, the bill is \ inch 

 longer than in those of San Diego Co. 



Genus IL— Calypte, Gould Int. Troch., 1861, p. 87. 



Type O. costae, Bourcier. 



Bill longer than the head, straight or slightly arched. Feathers 

 of crown and throat, brilliantly metallic. Tail short, the three 

 outer feathers stiff, narrow and slightly incurved, tarsi clothed. 

 Feet small, hind and fore toes nearly equal in length, the 

 metallic feathers on sides of neck very elongated. 



4. Calypte CosTjE. Bourc. Rev. Zool., 1836, p. 294. 



Mellisuga costce, Gray, Gen. of Birds. Vol. I., p. 113. 



Selasphorus costcs, Bonap., Consp., Gen. Av., 1850, p. 52. 



Atthis costoz, Reich, Aufz. der Colibr, 1853, p. 12. 



Leucaria costœ, Muls., Hist. Nat. des Ois. mou. t. IV., p. 69. 



Costa'' s Calypte, Gould, Mon. Troch. Vol. III., p. 1.14. 



Leucarie de Costa, Muls., Hist. nat. des Ois mou. t. IV., p. 69. 



Habitat. Mexico and California. 



Male. — Upperside bronzy green, head, throat and elongated 

 feathers of neck metallic purple with lilac and blue reflections, 

 according to light. Breast and centre of abdomen pure 

 white. Flanks pale bronzy green, undertail coverts white, bronzy 

 green at centre. I'ail green, two outer rectrices brownish gray 

 with black tips, bill black. 



Total length, 2-Jin. ; wing, if ; tail, 1 ; culmen, f. 



Female, Upperside bronzy-green, greyish on top of head. 

 Underside grayish-white, throat with a tew feathers forming 



