524 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



and feet brown; length (skins), 109.22-118.11 (113.28); wing, 63.50- 

 66.04 (64.52); tail, 42.16^6.23 (44.45); exposed culmen, 8.89-10.16 

 (9.40); depth of bill at base, 7.11-8.64 (7.87); tarsus, 15.24-16.26 

 (16.00); middle toe, 12.19-13.72 (12.95). > 



Adult female. — Similar to the adult male, but duller in coloration; 

 brown above, with pileum more broadly streaked with dusky on a 

 ground color of olive instead of yellowish, dusky streaks on back 

 broader, and yellow of under parts much less bright; length (skins), 

 110.49-111.25 (110.74); wing, 59.69-64.26 (61.72); tail, 40.64^43.18 

 (41.66); exposed culmen, 9.14-9.65 (9.40); depth of bill at base (one 

 specimen), 7.87; tarsus, 15.75-16.00 (15.87); middle toe, 12.70-13,21 

 <12.95).' 



Young in traimtion plumage. — Pileum dull brown, broadly streaked 

 with blackish; back and scapulars similar, but more fulvous and more 

 broadly streaked; rump j^ellowish olive-green; upper tail-coverts 

 brownish gray, darker centralh', and with still darker shaft-streaks: 

 lesser wing-coverts fulvous-olive; middle and greater coverts dusky 

 centrally, the former tipped with fulvous-olive, the latter tipped and 

 broadly edged with fulvous-buff or dull ochraceous; remiges dusky, 

 the tertials broadlj^ margined with light brown, the secondaries and 

 primaries narrowh' edged with a much 'paler tint; tail duskj^ with 

 light grayish brown edgings; an indistinct superciliaiy stripe of dull 

 yellow, becoming brighter yellow over lores; cheeks and auriculars 

 plain olive-brownish; under parts oil yellow tinged with brownish 

 across chest and along sides, and fading to primrose yellow on abdo- 

 men and under tail-coverts; flanks narrowlj^ and indistinctly streaked 

 with dusk}'; wing, 63.50; tail, 43.18; exposed culmen, 9.14; tarsus, 

 15.24; middle toe, 13.46.'' (Across the chest are many dull whitish 

 feathers marked with a mesia,l streak of dusky brown; but these 

 :feathers are remains of the streaked nestling plmnage.) 



Southeastern Mexico, in States of Vera Cruz (Orizaba) and Chiapas 

 (Palenque), to Guatemala (Dueiias). 



This species is exceedingly similar to S. arvensis minor (Cabanis), of 

 Guiana, but is rather paler in coloration, an adult male of 6". a. minor, 

 irom Annai, British Guiana,* having the blackish streaks on the back 

 darker, the olive-green of the rump darker, and the vellow of the under 

 parts deeper (lemon yellow on breast and a'bdomen), the chest, sides, 

 and flanks strongly shaded with olive-greenish, and the flanks indis- 

 tinctly streaked with duskj'. The measurements are practically iden- 

 tical. In the coloration of the under parts the adult male of N". chrysops 

 agrees closelj^ with an adult male of S. arvensis hiteirentris (Meyen) 



' Seven specimens. 



^ Three specimens. 



' Specimen in Salvin-Gfodman collection, from Dueiias, Guatemala, September, 1862. 



*No. 146049, U. S. Nat. Mus.; A. Boucard. 



