380 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



KEY TO THE SPECIES OF DIGLOSSA. 



a. Bluish gray above (darker on pileum). (Adult males. ) 



b. Under parts of body cinnamon or cinnamon-rufous. (Southern Mexico; Guate- 

 mala. ) Diglossa baritula, adult male ( p. 380) 



hh. Under })arts I (f body slate-gray. (Costa liica; Veragua. ) 



Diglossa plumbea, adult male (p. 381) 

 an. Olive or olive-gi"ayisli above. (Adult females and young.) 



b. Under parts buffy or cinnamon-) )uffy (tinged with olive laterally). 



Diglossa baritula, adult female and young male (p. 380) 

 bb. Under parts pale olive, light grayisli olive, or olive-grayish. 



Diglossa plumbea, adult female and young male (p. 381) 



DIGLOSSA BARITULA Wagler. 

 MEXICAN DIGLOSSA. 



Adult male. — Head and neck, except throat, blackish slate or slate- 

 blackish, darker (nearly black) on forehead and lores, more grayish on 

 sides of neck; back, scapulars, rump, upper tail-coverts, and lesser 

 wing-coverts plain slate color anteriorly, passing into slate-gray pos- 

 teriorly; wings and tail dusk}^ with slate-gra}' edgings, the middle 

 wing-coverts broadly margined with slate-gray; lower throat, under 

 parts of body, under tail-coverts, axillars, and under wing-coverts 

 plain rufous-cinnamon or russet; maxilla brownish black, mandible 

 blackish terminally and on terminal half of gonys, otherwi.se pale 

 brownish or brownish white (in dried skins); legs and feet horn brown- 

 ish (in dried skins); length (skins), 100.1-109 (105.2); wing, 55.1-58.7 

 (57.2); tail, 42.2-46.7 (4.5); exposed culmen, 9.4-10.7 (9.9); tarsus, 16-18 

 (17.3); middle toe, 9. 9-11. -J (10.9).^ 



Adult female. — Above, including sides of head and neck, plain olive, 

 lighter and rather brighter on lower rump and upper tail-coverts; 

 under parts l)rownish butfy, strongly tinged on chest, sides, and tianks 

 with pale olive; remiges and rectrices dusky with light olive edgings, 

 these broader and approaching dull white on tertials; bill and feet as 

 in adult male; length (skins), 102.1-112.3 (108.2); wing, 54.9-55.1 

 (55.1); tail, 43.2-47.5 (45); exposed culmen, 9.7-10.2 (9.9); tarsus, 

 16.5-17.8 (16.8); middle toe, 10.4-11.4 (10.7).' 



Young male. SunWiiv to the adult female, but duller olive abov^e; 

 greater wing-coverts indistinctly tipped with pale brownish and tertials 

 broadly edged with the same; under parts (sometimes, at least) slightly 

 tinged with cinnamon. 



Immatitre nialc — Variously intermediate in coloration between the 

 adult male and adult female, according to age. 



Southern Mexico, in States of Vera Cruz (Mirador; Jico), Mexico 

 (Valley of Mexico), Morelos (Tetela del Volcan; Huitzilac), Michoacan 



' Eight specimens, from Mexico. ^ Four specimens, from Mexico. 



