BIRDS OF NORTH AND MIDDLE AMERICA. 565 



d. Throat, chest, and back paler gray (ash gray) ; no distinct white spot on 

 side of throat. (Guiana to Columbia; Trinidad; Isthmus of Panama?) . 

 Sporophila grisea grisea, adult male (extralimital)^ 

 dd. Throat, chest, and l)ack darker gray (deep slate-gray); a conspicuous 

 white spot on each side of lower throat. (Isthmus of Panama.) 



Sporophila grisea schistacea, adult male (p. 566) 

 cc. Bill much smaller and weaker, dark-colored; rump ami under parts rufous 

 or chestnut. [Sporophila minuta. ) 

 d. Pileum, hindneck, and back brownish or brownish gray. (Isthmus of 

 Panama to lower Amazon Valley.) 



Sporophila minuta minuta, aiiult male (p. 567) 

 dd. Pileum, hindneck, and tiat-k clear gray. (Southern Mexico to Nica- 

 ragua) Sporophila minuta parva, adult male (p. 568) 



hh. Plumage of head and boily more or less marked with black. 



c. Back and rump olive; throat black, rest of under parts pale yellow. (Isthmus 



of Panama to Brazil and Peru.) Sporophila gutturalis. adult male (p. 569) 



cc. Back and rump not olive. 



d. Under parts wholly black.- (Southern Mexico to Costa Rica. ) 



Sporophila corvina. adult male (p. 571) 

 dd. Under parts not wholly black. 



e. Abdomen white or jiale Iniffy; riunp black. Itlack and white, or mostly 

 white. 

 /. Middle and greater wing-coverts wholly black; rump black or mostly 

 black; under parts usually with more 1)lack. (Isthmus of Panama to 



Guatemala.) Sporophila aurita, adult male (p. 573) 



jy. Middle and greater wing-coverts with white terminal spots; rump 

 mostly or largely white; under parts with black confined to band 

 across chest. (Southern Texas to Costa Rica. ) 



Sporophila morelleti, adult male (p. 575) 

 ee. Abdomen and rump cinnamomeous. 

 /. A white collar acro.ss hindneck. (Southern Mexico. ) 



Sporophila albitorquis, adult male (p. 578) 

 ff. No white collar across hindneck. (Western Mexico. ) 



Sporophila torqueola, adult male ( p. 577) 

 aa. Plumage unicol(jred, or nearly so, the upper parts not black, partly black, nor 

 gray. 

 b. Wings with distinct paler markings. 



r. Wings without bands, but coverts distinctly edged with buff or whitish. 

 d. General coloration more buffy. 



Sporophila minuta minuta, female and young (p. 567) 

 dd. General coloration less l)uffy. 



Sporophila minuta parva, female and young (p. 568) 

 cr. Wings with two distinct whitish l)ands. 



Sporophila morelleti, female and young (pp. 575, 576) 

 bb. Wings without paler markings. 

 c. Upper parts olivaceous. 



d. Under parts olivaceous, like upper parts, bat paler. 

 e. Abdomen white or whitish . . Sporophila aurita, female and young (p. 573) 

 ee. Abdomen pale olivaceous or dull buffy. 



Sporophila corvina, female and young (p. 571) 



' ILoxia] grisea Gmelin, Syst. Nat., i, 1788, 857. — SpermopMla grisea Sclater, Ibis, 

 1871, 18, part; Sharpe, Cat. Birds Brit. Mus., xii, 1888, 96, part. — Sporophila grisea 

 Chapman, Bull. Am. Mus. Nat. Hist., vi, 1874, 33 (Trinidad; song). 



^Sometimes there is a trace of white, more rarely of chestnut, in middle of abdomen. 



