BIRDS OF NORTH AND MIDDLE AMERICA. 11 



gg. Bill longer and more slender (exposed culmen 7.1-7.6, depth at base 



3.3-3.7); yellow of forehead deeper (bright lemon), not extending 



beyond middle of eyes; yellow of under parts deeper, with dusky 



clouding on sides and flanks. ( Guatemala to Isthmus of Panama. ) 



Euphonia minuta humilis, adult male (p. 23) 



dd. Throat yellow, like rest of under parts. 



e. Yellow of forehead not extending beyond middle of eyes, its posterior 



outline directly transverse or truncated. '(Southern Mexico to Costa 



Rica.) Euphonia hirundinacea, adult male (p. 25) 



ee. Yellow of forehead extending much beyond eyes, with strongly convex 

 or rounded posterior outline. (Costa Rica to Colombia. ) 



Euphonia orassiroatrifl, adult male (p. 28) 

 bb. Back olive-green or olive-gray. 

 c. Abdomen or under tail-coverts (or both) tawny or ochraceous; back, etc., 

 strongly glossed with metallic greenish. 

 d. Forehead and fore part of crown lemon yellow. (Southern Mexico to Costa 



Rica. ) Euphonia gonldi, adult male (p. 29) 



dd. Forehead chestnut. 



e. Abdomen .deep olive-yellowish Euphonia gouldi, adult female (p. 29) 



ee. Abdomen tawny or ochraceous. 

 /. Larger (wing 57.4-58.4); whole abdomen tawny. 



Euphonia gracilis, adult female (p. 20) 

 jf. Smaller (wing48.8); only median line of abdomen tawny or ochraceous. 



Euphonia fulviorissa, adult female (p. 18) 

 cc. Neither abdomen nor under tail-coverts tawny or ochraceous. 

 d. Back bright olive-green. 

 e. Occiput olive-green, like back. 

 /. Median under parts (broadly) grayish, in strong contrast with yellowish 

 olive-green of sides and flanks. 

 g. Under tail-coverta grayish brown with whitish tips; forehead strongly 

 tinged with rusty; gray of median under parts much darker. 



Euphonia anneae, adult female (p. 17) 



gg. Under tail-coverts light olive-yellow; forehead and crown yellowish 



olive-green, like rest of upper parts; gray of median under parts 



much paler Euphonia hirundinacea, adult female (p. 26) 



ff. Median under parts yellow, like sides and flanks, or at least so on chest. 

 g. Under parts entirely yellow or oUve-yellow; under tail-coverts yellow. 

 h. Larger (wing 59.7-63.5), with much stouter bill; inner webs of 

 outermost rectrices with a subterminal white spot. 



Euphonia crassirostris, adult female (p. 28) 

 hh. Smaller (wing 51.0-51.8); inner webs of outermost rectrices with- 

 out any white Euphonia luteicapilla, adult female (p. 21) 



gg. Under parts with lower throat pale gray, lower abdomen and under 

 tail-coverts white. 



Euphonia miuuta humilis, adult female (p. 24) 

 ee. Occiput grayish, more or less distinctly different from olive-green of back. 

 /. Abdomen and under tail-coverts white. 



Euphonia godmani, adult female (p. 25) 

 ff. Under parts wholly yellowish, the under tail-coverts clear lemon 



yellow Euphonia affinis, adult female ? (young male ?) (p. 22) 



dd. Back olive-grayish. 



Euphonia affinis, young female ? (adult female ?) (p. 23) 



