BIRDS OF NORTH AND MIDDLE AMERICA. 363 



Range. — Guatemala to Colombia and Vcnoziiela. (Two species.) 

 While closely resemblin<]j, superficially, the type species of Aplian- 

 iocJiroa Gould, this o-enus dift'ers in relatively lono;er tail (more, 

 instead of less, than three-fifths as long as wins:;), ridged instead of 

 rounded culmen, and less distinct lateral sulci of maxilla and mandi- 

 ble. The coloration is very similar but Aphantochroa lacks the 

 white tips to the lateral rectrices, so conspicuous in both sexes of 

 both species of PhseocJiroa. The two groujis are, however, very 

 closely related, and PhseocJiroa undoubtedly is more nearly allied to 

 Aphantochroa than to Cainpylopterus. 



KEY TO THE SPECIES AND SUBSPECIES OF PH/EOCHROA. 



a. Basal half (approximately) of mandible jjale brownish or whitish (reddish or 

 pinkish in life); lateral rectrices extensively bronze-greenish basally. (Phseo- 

 chroa cuvicri.) 

 b. Green of under parts paler; abdomen paler, more buffy; bill slightly shorter. 

 (Western Costa Rica to northern Colombia; coast of Venezuela?) 



Phaeochroa ciivierii cuvierii (p. 363). 

 bb. Green of under parts darker; abdomen darker and more l)r()wnish; bill slightly 

 longer. (Coiba Island, Bay of Panama.) 



Phaeochroa cuvierii saturatior (p. 365). 

 aa. Mandible wholly dusky; lateral rectrices with little if any bronze-green on basal 

 portion. (Guatemala and British Honduras to eastern Nicaragua.) 



Pheeochroa roberti (p. 365). 



PHiEOCHROA CUVIERII CUVIERn (Delattre and Bourcier). 



CUVIER'S HUMMING BIRD. 



Adults (sexes alike). — Above metallic bronze-green (sometimes 

 more bronzy posteriorly), the tail usually more bluish or silvery green; 

 lateral pair of rectrices extensively grayish white terminally (usually 

 tinged on outer web with gray)," this sejiarated from the bronze- 

 greenish basal portion by an ill-defined band of dull blackish or 

 dusky, tlie second pair with a less extensive, but still conspicuous, 

 whitish tip, the third sometimes sliglitly tipped with grayish; rcmiges 

 dark brownish slate or dusky, faintly glossed with purplish; chin, 

 throat, chest, and sides of breast rather dull metallic bronze or bronze- 

 green, the feathers narrowly margined with didl gi-ayish buify or pale 

 buffy grayish; flanks, abdomen, and median line of breast pale 

 Isabella color or pale, dull brownish bufl'y, the first glossed with 

 bronze or bronze-green ; femoral tufts and tuft on each side of rump 

 white, the latter usually intermixed with pale grayish; under tail- 

 coverts dull metallic bronze or bronze-greenish, broadly margined 

 with white; bill dull l)lack, the basal half (more or less) of mandible 

 pale brownish or whitish (fleshy or pinkish in life); iris dark brown, 

 feet dusky. 



" Sometimes there is a bronze-dusky spot at tij) of outer web. 



