4GU bi:llj:tin .jo, united states national museum. 



Coloration. — A])ovo plain dusky slate, olive, or olive-green, the 

 pileuni rufous or with light-colored median stripe (whole head and neck 

 sometimes rufescent); beneath A'ellow, or white with chin and throat 

 yellow, white, or gray: never streaked nor spotted, either jabove or 

 below, except in nestling plumage. 



lianc/c. — Mexico to Peru, Bolivia, Argentina, and Guiana, in high- 

 lands. 



The t^'pe of this genus is somewhat more slender, with smaller bill 

 and narrower rectrices, than the other species which I consider to be 

 congeneric with it (usualh" referred to the genus Bitarremon)., but the 

 structural diti'erences between A. pileatuH and an}" of the others are 

 very insignilicant compared with those between different species of 

 Almophila^ Ammodramus^ CardinaUs^ Pipilo^ and other genera. 



KEY TO THE SPECIES AXIJ SUBSPECIES OF ATLAPETES. 



(;. Pileuin xmiforni rufous; rest of upper parts olive-green; sides of head gray 

 (becoming blackish on lores and orbits). {Atla:][)etes i->\leatiKS.') 

 h. Darker and browner above, with under parts brighter yellow. (Southern and 



central portions of Mexican plateau.) Atlapetes pileatus pileatus (p. 460) 



hh. Paler and grayer above, with under jiarts paler yellow. (Northwestern por- 

 tion of Mexican i:>lateau. ) Atlapetes pileatus dilutus ( ] >. 4()1 ) 



aa. Pileuni black, relieved by a white median stripe; rest of upper parts olive-dusky 

 or dark slaty; sides of head black. 

 h. Under parts yellow medially, olivaceous laterally. (Southern ^Mexico; Colom- 

 bia.) Atlapetes albinucha (p. 463) 



hh. Only the chin, throat, and malar region yellow, the rest of under parts white 

 medially, gray laterally. (Guatemala to Colombia. ) 



Atlapetes gutturalis (p. 461) 



ATLAPETES PILEATUS PILEATUS Wagler. 

 RUFOUS-CAPPED SPARROW. 



Adults {se.ees aJUr). — Entire pileum chestnut-rufous; rest of upper 

 parts plain olive-brownish, passing into gray on sides of head and 

 neck; under parts yellow, tinged with olive laterally; maxilla ])lack 

 or blackish brown, mandil)le horn lirownish; legs and feet light 

 brownish. 



Young. — Pileum olive-brownish, like back, etc.; under parts dull 

 butfy yellowish, becoming olive- brownish on sides and flanks, the 

 chest more or less mottled or clouded with light brownish. 



Adult ;//^//e.— Length (skins), 127.00-152.40 (145.80); wing, 63.50- 

 71.12 (67.06); tail, 64.26-73.15 (71.63); exposed cidmen, 10.92-12.45 

 (11.94); depth of bill at base, 6.35-8.13 (7.37); tarsus, 23.37-25.40 

 (24.38); middle toe, 14.48-16.76 (16.00). ^ 



Adult fimale.—l^en^th (skins), 137.16-152.40 (144.78); wing, 61.72- 

 69.85 (65.02); tail, 62.23-73.66 ((57.06); exposed culmen, 11.4.3-12.70 

 (11.94); depth of bill at l)ase, 7.11-8.13 (7.37); tarsus. 23.37-25.40 

 (24.13); middle toe, 15.24-16.51 (15.75).' 



^ Thirteen specimens. -' Five specimens. 



