502 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Range. — Southern Mexico to western Panama, in higher moun- 

 tains. (Seven species.) 



The proper disposition of Trochilus viridipallens Bourcier and 

 Mulsant which both Elhot and Hartert place in " C(rligena" (= Cya- 

 nolsemus) — both authors uniting Ccellgena and " Delattria" — and its 

 near relative, '* Delattria" syhillse. Salvin, is a matter of difficulty and 

 uncertainty; but I am convinced that unless a new genus is made for 

 their accomodation they fit far better in Oreopyra than in " Delattria.^' 

 The only alternative is to consider Oreopyra as also a synonym of 

 ' ' Delattria ' ' = Lanipornis. 



KEY TO THE SPECIES AND SUBSPECIES OF OREOPYRA. 



a. Under parts mostly green or mostly white. 



b. A conspicuous patch of white or purple on throat; ])ileum brilliantly metallic 

 green, 

 c. Chest bright metallic green; chin white or purple, like throat. 

 d. Tail black or blue-black. {Oreopyra castaneoventris.) 

 e. Throat white; or if purple the feathers white beneath surface. (Volcan 

 de Chiriv']ui, Panama.) 



Oreopyra castaneoventris castaneoventris, adult male (p. 502). 

 ec. Throat metallic purple, the feathers gray beneath surface. (Costa Rica 

 to western Panama.) 



Oreopyra castaneoventris calolaema, adult male (p. 504). 

 (id. Tail gray (the throat white). (Southwestern Costa Rica.) 



Oreopyra cinereicaiida, adult male (p. 506). 

 cc. Chest white; chin metallic green. (Costa Rica.) 



Oreopyra hemileuca, adult male (p. 507). 

 hh. No throat-patch of white or purple; pileum not brilliantly metallic. 

 <■. Throat metallic green squamated or otherwise broken by white. 

 d. Chest and foreneck green like throat. (Nicaragua.) 



Oreopyra sybillse, adult male (p. 508). 

 dd. Chest and foreneck white. (Guatemala and Chiapas.) 



Oreopyra viridipallens, adult male (p. 509). 

 cc. Throat white or buff, or mostly so. 



d. Throat white; outermost rectrix ])ale gray. 



Oreopyra viridipallens, adult female (p. 510). 

 dd. Throat buff; outermost rectrix white, the inner web crossed by a sub- 

 terminal bar of dusky gray Oreopyra sybillae, adult female (p. 509). 



aa. Under parts tawny-ochraceous. 



h. Lateral rectrices with a well-defined broad subterminal area of blackish. 



Oreopyra castaneoventris castaneoventris, adult female (p. 503). 

 Oreopyra castaneoventris calolsema, adult female (p. 505). 

 66. Lateral rectrices without a well-defined (if any) subterminal area of dusky. 



Oreopyra cinereicauda, adult female (p. 506). 



OREOPYRA CASTANEOVENTRIS CASTANEOVENTRIS (Gould). 



CHIRIQUf MOUNTAIN GEM. 



Adult male. — Forehead and crown glittering metallic emerald 

 green, varying to yellowish green and bluish green; rest of upper 

 parts duller metallic bronze-green, becoming more bluish green or 



