FAMILY TROCHILIDAE 25 1 



36. Smaller, wing less than 39 mm. ; tail more extensively buff. 



Scintillant hummingbird, Selasphorns scintilla, female and 



immature male, p. 377 

 Larger, wing more than 40 mm. ; tail less extensively buff, central feathers 

 mainly or wholly green. 



Volcano hummingbird, Selasphorus flammula torridus, female 



and immature male, p. 373 



37. Central rectrices mainly or wholly rufous-brown, like rest of tail 38 



Central rectrices wholly or mainly metallic green 39 



38. Smaller, wing not more than 61 mm., tail not more than 35 mm. 



Rieffer's hummingbird, Amasilia tcacatl tzacatl, p. 333 

 Larger, wing 67 mm., tail 40 mm. or more. 



Escudo hummingbird, Amasilia handleyi, p. 336 



39. Foreneck and breast black or green, without white (adult males) 40 



Foreneck and breast dark centrally, bordered on either side with 



white (females and immature males) 41 



40. Throat, center of breast, and abdomen black. 



Elack-throated mango, Anthracothorax nigricollis, adult male, p. 294 

 Breast and lower foreneck metallic green (upper foreneck cen- 

 trally black in some individuals). 

 Prevost's mango, Anthracothorax prevostii veraguensis, adult male, p. 292 



41. Median stripe on lower surface entirely black. 



Black-throated mango, Anthracothorax nigricollis, female 



and immature male, p. 294 



Median stripe on lower surface partly or wholly metallic blue Prevost's 



mango, Anthracothorax prevostii veraguensis, female and 



immature male, p. 292 



42. Wing 56 mm. or less ; of more, with prominent white tibial tufts 43 



Wing 61 mm. or more ; tibial tufts, if present, small 60 



43. Upper tail coverts and lower rump feathers bright coppery brown, 



in strong contrast to green of back ; white tibial and femoral tufts greatly 



enlarged Green puff-leg, Haplophacdia aureliae, p. 361 



Upper tail coverts and lower rump feathers green, bronze-green, or reddish 

 purple (not bright coppery brown) 44 



44. Base of tail white or grayish white; size very small (male with 



crown white) . .. .Snow-cap, Microchcra albocoronata albocoronata, p. 342 

 Base of tail not white or grayish white 45 



45. Central tail feathers and rest of tail mainly blackish to deep blue 46 



Central tail feathers, and usually rest of tail basally or 



wholly green, bronze-green, or bronze 49 



46. Rectrices of slender form (very narrow), size small. 



Gorgetted wood-star, Acestrura heliodor heliodor, adult male, p. 372 

 Rectrices of normal form ; size, small to medium 47 



47. Tail deeply forked, more than 35 mm. long. 



Fork-tailed woodnymph, Thalurania fitrcata, adult male, p. 306 

 Tail not forked, or if slightly forked less than 30 mm. long 48 



48. Bill entirely black ; under surface in adult male glittering green ; 



in female and young male dull white, with a small white spot behind eye. 

 Allied emerald, Chlorostilbon assimilis, p. 303 



