436 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



distally and tipped with pale grayish brown, both the subterminal 

 black and the terminal pale grayish or brownish, increasing in width 

 toward the outermost rectrix, on which they are both broader and 

 paler (sometimes dull white) and the black extends nearly if not 

 quite to the extreme base; forehead and malar region mikado brown 

 or cinnamon, fading into dull white to light cinnamon on chin and 

 upper throat (sometimes whole throat); foreneck and chest deep 

 drab to buffy brown or light olive-brown, passing into rather deeper 

 brown on sides and flanks and into pale buff to buffy white on abdo- 

 men, the under tail-coverts more deeply buffy; axillars and under 

 wing-coverts olive-brown to sepia-brown or nearly Vandyke brown; 

 length (skins), 194-220 (207); wing, 110-118 (114.3); tail, 71.5-82.5 

 (76.4); exposed culmen, 12.5-15 (13.8); tarsus, 21.5-23.5 (22.4); 

 middle toe, 18.5-21.5 (20.6)." 



° Five specimens. 



Both Salvadori (Oat. Birds Brit. Mus., xxi, 496) and Salvin and Godman (Biol. 

 Centr.-Am., Aves, iii, 257) call attention to the fact that Mexican and Guatemalan 

 specimens differ from South American ones in having "the under wing-coverts black, 

 with no admixture of cinnamon-rufous." The last named authors remark that while 

 "it is possible that the Central American form is distinct from that inhabiting South 

 America," they "have not as yet seen a specimen from Costa Bica," and assume that 

 there is a gap in the geographic range of the species. While I have not been able to 

 examine an adult male from any South American locality, I have, however, seen 

 specimens from not only Costa Rica but western Panama (Chiriqui) also, and am able 

 to state that all of these (five males, altogether) have the axillars and under wing- 

 coverts uniform dark grayiah-brown (not black), like two adult males from Mexico, and 

 that all the Central American birds therefore differ in this respect from South American 

 ones. 



The two adult males from Mexico (definite localities not known), while agreeing 

 with the five examples from Costa Eica and western Panama in color of the axillars and 

 under wing-coverts and coloration in general, differ from them in having the color of 

 the back, scapulars, rump, and upper tail-coverts decidedly darker and browner, the 

 color of these parts being fuBcous to nearly chaetura drab instead of deep neutral gray. 

 Both specimens, however, retain traces of the young plumage (the secondaries of the 

 first plumage having not yet been replaced), and the differences noted may, therefore, 

 be owing to difference of age. 



Adult females from Venezuela and Colombia appear to be not different from Central 

 American ones. 



