FAMILY TROCHILIDAE 249 



9. Bill relatively long, more than half as long as wing 10 



Bill relatively short, less than half as long as wing 19 



10. Bill definitely curved, the basal half or more of mandible yellow or 



orange 11 



Bill straight, or nearly so, entirely black 17 



11. Tail very long; the central pair of feathers greatly elongated, twice as long 



as the outer pair 12 



Tail of normal length ; square, or, if graduated, the central feathers not 

 conspicuously elongated 15 



12. Small, wing not more than 40 mm. 



Little hermit, Phaethornis longuemareus, p. 273 

 Large, wing more than 50 mm 13 



13. Darker gray on lower surface; above metallic bluish green. 



Green hermit, Phaethornis guy coruscus, p. 263 

 Brighter colored, buffy gray on lower surface; above dull metallic bronze- 

 green 14 



14. Upper tail coverts cinnamon, barred with dull black. 



Long-tailed hermit, Phaethornis snperciliosus, p. 266 

 Upper tail coverts dull metallic bronze-green, edged with buff. 



Black-cheeked hermit, Phaethornis anthophilus, p. 270 



15. Base of tail white; chin dull black. 



Rucker's hermit, Threnetes ruckeri, p. 260 

 Base of tail cinnamon-rufous ; chin not black 16 



16. Hindneck to central tail feathers metallic green, varying in some to slightly 



bronze Hairy hermit, Glaucis hirsuta affinis, p. 257 



Hindneck to upper tail coverts strongly bronze-green to coppery bronze. 

 Bronzy hermit, Glaucis aenea aenea, p. 255 



17. Bill very slender ; upper tail coverts blue. 



Green-fronted lancebill, Doryfera ludoviciae, p. 279 

 Bill strong and heavy ; upper tail coverts green or bronze 18 



18. Larger, wing 68 to 80 mm.; male with crown purple, throat greenish blue; 



female with under surface brownish gray. 



Rivoli's hummingbird, Eugenes julgens spectabilis, p. 359 

 Smaller, wing 57 to 63 mm. Male, crown greenish blue; throat reddish 

 purple. Female, crown green like back, upper throat black. 



Long-billed star-throat, Heliomaster longirostris longirostris, p. 366 



19. Under tail coverts definitely specialized; broadened and elongated, or 



with those in the center thickened, stiffened, curved and elongated... 20 

 Under tail coverts normal, not specialized 23 



20. Larger species, wing more than 60 mm. ; under tail coverts prominently 



broadened and elongated 21 



Smaller species, wing less than 55 mm. ; central under tail coverts somewhat 

 elongated, much thickened, stiffened and curved 22 



21. Bill black; under tail coverts white, long and broad, more than half as long 



as tail Black-billed plumeleteer, Chalybura buffonii micans, p. 344 



Basal half or more of mandible yellow-orange ; under tail coverts prominent 

 but smaller, less than half as long as tail ; in male white, in female grayish 

 white Bronze-tailed plumeleteer, Chalybura urochrysia, p. 346 



