BIRDS OF KORTH AND MIDDLE AMERICA. 



587 



similar but paler; a whitish orbital ring, interrupted on middle of 

 upper eyelid; lores blackish, usuall}" more or less intermixed with dull 

 whitish; chin and throat pale grayish or dull grayish white, more or 

 less tinged with pale ^^ellowish and usually somewhat suffused or inter- 

 mixed with dusky; chest and sides varying from rather light grayish 

 brown to almost sepia, becoming much paler on flanks; rest of under 

 parts pale yellow (primrose) ; maxilla dusky brown or blackish, 

 mandible pale, usually more or less brownish or dusky at tip; iris 

 dark brown; legs and feet dusky brown or blackish. 



Adults in autumn. — Similar to the summer plumage, but color of 

 back, chest, and sides browmer, the two latter sometimes approaching 

 raw-umber. 



Young. — Essentially like adults, but black of pileum usually duller, 

 more sooty. 



Adult maZ^.— Length (skins), 104-117 (111); wing, 57-62 (60); tail, 

 48.5-55 (51.1); exposed culmen, 9.5-11 (10.2); tarsus, 16-16.5 (16.2); 

 middle toe, 8-10 (9).« 



Adult female.— Length (skins) , 105-1 13 (110) ; wing, 55.5-59.5 (57.4) ; 

 tail, 47-51 (49.2); exposed culmen, 9.5-11 (10.2); tarsus, 15-16.5 

 (15.8); middle toe, 8-9 (8.7).'' 



Highlands of Costa Rica (Pirris; Achiote; Volcan de Irazu; Volcan 

 de Poas; Volcan de Turrialba; Dota Mountains; Rancho Redondo) 

 and western Panama (Volcan de Chiriqui, 10,000 to 11,000 ft. alt.). 



Empidonax atriceps Salvin, Proc. Zool. Soc. Lond., 1870, 198 (Volcan de Chiriqui, 

 Panama; coll. Salvin and Godman). — Ridgway, Proc. U. S. Nat. Mus., vi, 

 1883, 413 (Pirris, Costa Rica; description). — Salvin and Godman, Biol. 

 Centr.-Am., Aves, ii, 1889, 79, pi. 40, fig. 3. 



[Empidonax] atriceps Sclater and Salvin, Nona. Av. Neotr., 1873, 52. — Sharpe, 

 Hand-list, iii, 1901, 140. 



Mitrephanes atriceps Ridgway, Ibis, Oct., 1886, 461 (crit.). — Sclater, Cat. Birds 

 Brit. Mus., xiv, 1888, 220 (Irazii district, Costa Rica; Volcan de Chiriqui). — 

 Bangs, Proc. New Engl. Zool. Clnh, iii, 1902, 37 (Volcan de Chiriqui, 10,300 

 to 11,000 ft. alt.). 



a Thirteen specimens. 

 ''Nine specimens. 



