388 



BIRDS OF THE REPUBLIC OF PANAMA PART 4 



73. Patch of light gray on throat. 



female White-vented Euphonia, Euphonia minuta humilis. p. 399 

 Throat light yellow. 



female Yellow-throated Euphonia, Euphonia hirundinacea gnatho. p. 409 



74. Forecrown brown, turning yellow. 



female Tawny-capped Euphonia, Euphonia anneae. p. 397 

 Forecrown entirely yellow. 



female Orange-bellied Euphonia, 



Euphonia xanthogaster oressinoma. p. 395 



75. Brown on belly 76 



No brown on belly 78 



76. Forecrown yellow. 



male Olive-backed Euphonia, Euphonia gouldi praetermissa. p. 404 

 Forecrown brown 77 



77. Feathers of brown forecrown dark at base, chestnut of undersurface paler, 



less extensive. 



female Fulvous-vented Euphonia, Euphonia f. fulvicrissa. p. 402 

 Feathers of forecrown entirely brown, chestnut of undersurface darker and 

 more extensive. 



female Spot-crowned Euphonia, FAiphonia imitans. p. 405 



78. Undertail coverts brown. 



female Olive-backed Euphonia, Euphonia gouldi praetermissa. p. 404 

 Undertail coverts yellow 79 



79. Bill always thick, usually longer, 9.2-10.8 (9.8) mm. 



female Thick-billed Euphonia, Euphonia laniirostris crassirostris. p. 408 

 Bill always thinner, usually shorter, 7.9-9.7 (8.7) mm. 



female Yellow-crowned Euphonia, FAiphonia luteicapilla. p. 401 



80. Undersurface entirely yellow. 



female Black-and-yellow Tanager, Chrysothlypis chrysomelas. p. 487 

 Some white or gray on undersurface 81 



81. Throat orangish yellow, breast drab brown. 



Yellow-throated Bush-tanager, Chlorospingus 



flavigularis hypophaeus. p. 496 

 Throat and breast uniform 82 



82. Throat, breast, and undertail coverts light yellow, rest of undersurface white. 



female Yellow-backed Tanager, Hemithraupis flavicollis ornata. p. 486 

 Throat and breast orangish yellow, sides, flanks and undertail coverts green. 



Tacarcuna Bush-tanager, Chlorospingus tacarcunae. p. 494 



TERSINA VIRIDIS OCCIDENTALS (Sclater): Swallow-Tanager, 

 Azulejo Golondrina 



Figure 32 



Procnias occidentalis P. L. Sclater, 1855, Proc. Zool. Soc. London, 22 (1854), p. 

 249. (Bogota collections.) 



Medium size; male, mostly bright light blue with black on forehead 

 and throat; female mostly shining dark green with whitish yellow belly. 



Description. — Length 137-147 mm. Adult male, forehead, orbital 

 region, and throat black; upper surface and wing coverts bright light 



