Carriker : List of the Birds of Costa Rica. 599 



j. Throat feathers black, white terminally; chest not 

 streaked; uniformly grayish-olive above; breast and 

 abdomen dull buffy-olive. 



Myrmolherula fulviventris, 9 . 



jj. Throat feathers not black basally; chest streaked; upper 



parts grayish-olive or olive-brown. 



k. Pileum slate-gray or buffy-brown, streaked with 



black, but never spotted; back grayish-olive. 



/. Pileum slate-gray, throat and chest ashy, streaked 



with white and black; flanks buffy-olive. 



Dysithamnus striaticeps, $ . 



II. Pileum brown; under parts nearly uniformly buff- 



ochraceus, finely penciled with black on throat 



and chest. Dysithamnus striaticeps, 9 • 



kk. Pileum black, spotted with white or with buff-och- 



raceous. 



/. Upper part slate-gray, spots on head white; below 



white, breast streaked with black; sides, flanks, 



and belly cinereous. 



Dysithamnus puncticeps, $ (extralimital). 

 II. Upper parts brownish, spots on head rufous; ab- 

 domen pale fulvous. 



Dysithamnus puncticeps, 9 (extralimital). 



ii. Middle and greater wing-coverts not tipped with white 



(only lesser); pileum black, penciled with white; lower 



parts grayish-olive, streaked on throat and breast with 



white. Thamnophilus bridgesi, 9 • 



gg. Neither throat nor chest streaked or mottled. 



h. Wings and tail bright chestnut-rufous; upper parts rich 

 brownish-olive, below yellowish-olive. 



Thamnistes anabatinus saturatus, $ , 9 • 

 hh. Wings and tail not rufous-chestnut. 



i. Back and wings grayish-olive, with a decided greenish 

 tinge; pileum slate-gray. 

 j. Throat and chest pale ashy, slightly mixed with white; 

 abdomen pale yellow, flanks olive. 



Dysithamnus mentalis septentrionalis, $ . 

 jj. Chest olive, like flanks; grayish-white of throat slightly 

 greenish. 



Dysithamnus mentalis septentrionalis, 9 • 



ii. Back and wings grayish-brown or brownish-ash; pileum 



nearly or quite concolorous with back. 



j. Size larger (wing, 65 mm.); decidedly brownish above; 



wing-coverts tipped with buffy and lower parts dull 



grayish-buff y, with slight olive tinge; tail tipped with 



white. Thamnophilus ncsvius alrinucha, 9 • 



jj. Size smaller (wing, 52 mm.); brownish-ashy above. 



