510 Annals of the Carnegie Museum. 



22 5- Cypseloides cherriei Ridgway. 



Cypseloides cherriei Ridgway, Proc. U. S. Nat. Mus., XVI, 1893, 43 (Volcan de 

 Irazu [Geo. K. Cherrie]). 



This remarkable form is known only from the single specimen from 

 which it was described, which was collected somewhere on the Volcan 

 de Irazu by Mr. Cherrie for the Museo Nacional de Costa Rica, by 

 which it was presented to the U. S. National Museum. 



Family TROCHILID^E. 



Key to the Costa Rican Species. 



a. Exposed culmen not less than 29 mm. in length (measured in a straight line 

 from frontal base to tip), usually more. 

 b. Bill straight or almost straight, not decidedly curved; entirely black. 

 c. Under parts dark shining green, with or without glittering throat. 



d. Throat not glittering, crown reddish coppery; forehead glittering green; 



rump bluish; bill very straight. Dory f era veraguensis, $ , 9 • 



dd. Throat glittering blue-green; crown glittering violet; upper parts soft 



shining grass-green. Eugenes spectabilis $ . 



cc. Under parts not green, or only slightly washed on sides. 



d. Throat glittering purplish or dark flame-color; white spot on rump. 

 e. Throat purplish; middle of breast, abdomen, and sides white. 



Floricola superba superba, $ , 9 • 

 ee. Throat dark flame-red; abdomen and sides drab. 



Floricola constanti constanti, $ , 9 • 

 dd. Throat dull brownish-drab, like breast and abdomen; sides washed with 

 green and under tail-coverts shining green; upper parts green, crown 

 dusky. Eugenes spectabilis, 9 • 



bb. Bill more or less decidedly curved; mandible mainly flesh-color or reddish, 

 or else throat blue or violet. 

 c. Tail long and wide, with nearly apical half of outer rectrices white; bill 

 entirely black; throat violet or violet-blue. 

 d. Entire under parts, nape, and upper back deep, shining violet. 



Campylopterus hemileucurus mellitus, $ . 

 dd. Only middle of throat violet-blue; grayish drab below; sides of body 

 and under tail-coverts greenish. 



Campylopterus hemileucurus mellitus, 9 • 



cc. Tail variously shaped, but never with outer rectrices more than tipped with 



white. 



d. Central pair of rectrices greatly elongated, the elongated portion whitish. 



e. Lower parts ashy-gray; upper parts blue-green; tail narrowly edged 



with white at tip; cinnamon malar and gular stripe. 



Phaethornis guy coruscus, 9 • 

 ee. Lower parts buffy-ochraceous ; buffy-bronze above, more ochraceous 



