10 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



d. Chin and throat glossy blue-black; under parts of body and lower rump 



orange-ochraceous. (Haiti. ) Euphonia musica, adult male (p. 13) 



dd. Chin and throat yellow; under parts of body and whole rump yellow. 



(Porto Rieo. ) Euphonia sclateri, adult male (p. 15) 



hh. Back olive-green. 

 c. Forehead chestnut; throat pale cinnamon. 



Euphonia elegantissima, adult female (p. 12) 

 cc. Forehead not chestnut; throat yellow. 

 d. Forehead ochraceous; crown, occiput, and hindneck azure blue. 



Euphonia musica, adult female (p. 14) 

 dd. Forehead gamboge yellow; crown, occiput, and hindneck light cerulean 

 or turquoise blue. 

 e. Sides of head greenish dusky; back glossed with metallic bluish green. 

 (Lesser Antilles, St. Bartholomew to Grenada. ) 



Euphonia flavifrons, adult male (p. 15) 

 ee. Sides of head yellowish olive-green, like back; back without distinct 

 metalic gloss. 

 /. Bill larger (exposed culnien 7.4 or more, depth at base 4.8 or more); 

 under parts less yellowish olive-green. 



Euphonia flavifrons, adult female (p. 16) 

 ff. Bill smaller (exposed culmen 6.7, depth at base 4.6); under parts 



more yellowish olive-green Euphonia sclateri, adult female (p. 15) 



aa. Crown, occiput, and hindneck not light blue. 



h. Back dark steel blue or glossy blue-black or violet-black. 

 c. Throat black or dark steel blue or violet. 



d. Throat black; forehead, crown, and occiput rufous-tawny. (Costa Rica; 



Veragua. ) • Euphonia anneas, adult male (p. 17) 



dd. Throat dark steel blue or glossy ^^olet-black; forehead yellow. 

 e. Under tail-coverts tawny-ochraceous; abdomen yellowish ochraceous. 

 ( Northern Colombia to Isthmus of Panama. ) 



Euphonia fulvicrissa, adult male (p. 18) 

 ee. Under tail-coverts not tawny; abdomen pure yellow. 

 /. Under tail-coverts lemon or canary yellow. 



g. Inner webs of outermost rectrices wholly black or with only a small 



'spot of white on edge near tip; whole crown yellow. 



h. Larger (wing 55.9-61); occiput dark steel-blue, like hindneck, the 



yellow of crown extending much farther backward medially 



than laterally, the yellow feathers with triangular central spots 



of black. (Costa Rica; Veragua.) 



Euphonia gracilis, adult male (p. 19) 

 hh. Smaller (wing 55.1-55.9) ; occiput yellow, like crown and fore- 

 head, the yellow with straight or truncated posterior margin, 

 the yellow feathers without central spots of black. (Costa Rica; 



Veragua. ) Euphonia luteicapilla. adult male (p. 20) 



gg. Inner webs of outermost rectrices extensively (more than one-half) 

 white. (Southern Mexico to Costa Rica.) 



Euphonia affinis, adult male (p. 21) 

 ff. Under tail-coverts white (sometimes tinged with yellow). 



g. Bill shorter, much stouter (exposed culmen 6.9-7.4, depth at base 

 4.6-5.1); yellow of forehead paler, extending to posterior angle of 

 eye; yellow of under parts lighter, without dusky clouding on sides 

 and tlanks. ( Western Mexico. ) 



Euphonia godmani, adult male (p. 24) 



