302 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



JUNCO FULVESCENS Nelson. 

 CHIAPAS JUNCO. 



Similar to ./. j)hcmnohii< in pattern of coloration. 1)ut colors differ- 

 ent: wing and tail much .smaller, but bill and feet much larger and 

 stouter. 



Adult in summer {sexes alike).— VWquiw and hindneck, together with 

 sides of head and neck, plain deep smoke gray (decidedly browner or 

 more olivaceous than in J. pliaionotus)\ lores and orbital region black- 

 ish or dusky; malar region and under parts in general ver}^ pale Initfy 

 gray or didl grayish white, becoming more decidedly white on abdo- 

 men; ilanks light wood brown, the sides similar but graj'er; under 

 tail-coverts pale buff or buffy whitish with concealed central areas of 

 olive-grayish; back, scapulars, and outer surface of greater wing-cov- 

 erts and tertials cinnamon-brown or raw-umber brown, abruptly 

 defined against the brownish gray of the hindneck, but posteriorly 

 gradually passing into the light olive-brown of the rump, the latter 

 into a paler and slightly grayer hue on upper tail-coverts; remiges and 

 eight middle rectrices dusky hair brown, the latter edged with olive- 

 grayish, the primaries narrowl}" edged with pale gray; outermost 

 rectrix with about the terminal half (or less) white, the outer web 

 with white extending farther toward base; second rectrix with much 

 less than terminal half of inner web white; maxilla brownish black, 

 mandible yellowish; legs and feet clear light yellowish brown or 

 brownish straw-color. 



Adults in winter. — Similar to summer adults, but plumage softer and 

 colors darker; the back, etc., approaching chestnut-brown, or mars 

 brown, greater wing-coverts and tertials decidedly approaching chest- 

 nut, the gray of pileum and hindneck purer (more mouse gray), and 

 color of chest, etc., decidedly approaching ver}" pale smoke gray. 



Young. — Pileum and hindneck light olive-brown narrowly streaked 

 with blackish; l)ack and scapulars cinnamon-brown streaked with 

 black, the rump similar but more narrowly and obsoletely streaked; 

 chin, throat, and chest yellowish white, the lower throat (faintly) and 

 chest (strongly) streaked with blackish: sides and flanks light buff}'' 

 wood brown streaked with dusk}^; otherwise much like winter adults. 



Adult m«Z6.— Length (skins), 142.49-147.57 (146.05); wing, 68.58- 

 74.93 (71.87); tail, 62.99-68.o7 (64.77); exposed culmen, 12.45-13.21 

 (12.95); depth of bill at base, 7.87-8.38 (8.13); tarsus, 21.59-22.86 

 (22.10); middle toe, 14.48-15.49 (14.99).^ 



Adult female.— \^Q\\gi\\ (skins), 135.13-145.03 (140.97); wing. 64.26- 

 68.58 (67.06); tail, 58.17-62.23 (59.94); exposed culmen, 11.94-13.21 

 (12.45); depth of bill (one specimen), 8.13; tarsus, 21.34-22.35 (21.84); 

 middle toe, 14.22-15.24 (14.99).' 



^Six specimens. ^Four si^ecimens. 



