FAMILY FRINGILLIDAE 



5^9 



Plumage primarily black, with or without white 38 



38. Plumage entirely black 39 



Plumage black and white 40 



39. Small, less than 110 mm. 



male Blue-black Grassquit, Geospica jacarina splendens. p. 557 

 Large, more than 135 mm. 



male Great-billed Seed-finch, Sporophila maximiliani loftini. p. 578 



40. White on wing confined to base of primaries 41 



Primaries and wing coverts tipped white. 



male White-collared Seedeater, Sporophila torqueola morelleti. p. 564 



41. Culmen from base less than 12 mm. 



male Variable Seedeater, Sporophila americana. p. 566 

 Culmen from base more than 12 mm. 



male Lesser Seed-finch, Sporophila angolensis. p. 575 



42. No white in plumage 43 



White on wings and undersurface. 



male Slate-colored Seedeater, Sporophila schistacea schistacea. p. 563 



43. Small, less than 130 mm. 



male Slaty Finch, Haplospiaa rustica barrilesensis. p. 581 

 Large, more than 140 mm. 



Peg-billed Finch, Acanthidops bairdi. p. 582 



44. Undersurface buffy, yellowish brown, or olive-brown 49 



Undersurface rich reddish brown 45 



45. Upper surface brown 46 



Upper surface gray. 



male Ruddy-breasted Seedeater, Sporophila minuta centralis, p. 573 



46. Underwing coverts buffy or dark 47 



Underwing coverts white. 



female Lesser Seed-finch, Sporophila angolensis. p. 575 



47. Large, more than 135 mm 48 



Smaller, less than 125 mm. 



female Blue Seedeater, Amaurospiza concolor concolor. p. 579 



48. Bend of wing and underwing coverts warm buff. 



female Great-billed Seed-finch, Sporophila maximiliani loftini. p. 578 

 Bend of wing and underwing coverts dark grayish brown. 



female Blue-black Grosbeak, Passerina cyanoides. p. 548 



49. Throat and breast blackish, contrasting with rest of undersurface, 



or streaked 50 



Throat and breast not streaked or strongly differentiated from 



rest of undersurface 52 



50. Throat streaked 51 



Throat blackish. 



male Yellow-bellied Seedeater, Sporophila nigricollis nigricollis. p. 571 



51. Small, less than 110 mm. 



female Blue-black Grassquit, Geospiza jacarina splendens. p. 557 

 Larger, more than 114 mm. 



female Slaty Finch, Haplospiza rustica barrilesensis. p. 581 



52. Upper surface olive-brow T n or dull brown 54 



Upper surface reddish brown 53 



