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 Elliot and Hartert place in “ Celigena”’ (= Cya- 
nolemus)—both authors uniting Celigena and “ Delattria””—and its 
near relative, ‘‘ Delattria” sybille 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”’ = Lampornis. 
KEY @0 THE SPECIES AND SUBSPECIES OF OREOPYRA. 
a. Under parts mostly green or mostly white. 
b. A conspicuous patch of white or purple on throat; pileum 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 Chiriquf, Panam4.) 
Oreopyra castaneoventris castaneoventris, adult male (p. 502). 
ee. Throat metallic purple, the feathers gray beneath surface. (Costa Rica 
to western Panama.) 
Oreopyra castaneoventris calolema, adult male (p. 504). 
dd. Tail gray (the throat white). (Southwestern Costa Rica.) 
, Oreopyra cinereicauda, adult male (p. 506). 
cc. Chest white; chin metallic green. (Costa Rica.) 
Oreopyra hemileuca, adult male (p. 507). 
bb. No throat-patch of white or purple; pileum not brilliantly metallic. 
c. Throat metallic green squamated or otherwise broken by white. 
d. Chest and foreneck green like throat. (Nicaragua.) 
Oreopyra sybillz, adult male (p. 508). 
dd. Chest and foreneck white. (Guatemala and Chiapas.) 
Oreopyra viridipallens, adult male (p. 509). 
ce. Throat white or buff, or mostly so. 
d. Throat white; outermost rectrix pale 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 sybillz, adult female (p. 509). 
aa. Under parts tawny-ochraceous. 
b. Lateral rectrices with a well-defined broad subterminal area of blackish. 
Oreopyra castaneoventris castaneoventris, adult female (p. 503). 
Oreopyra castaneoventris calolema, adult female (p. 505). 
bb. Lateral rectrices without a well-defined (if any) subterminal area of dusky. 
Oreopyra cinereicauda, adult female (p. 506). 
OREOPYRA CASTANEOVENTRIS CASTANEOVENTRIS (Gould). 
CHIRIQUI MOUNTAIN GEM. 
Adult male—F¥orehead 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 
