J2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I43 



mixed flocks, in much the same way as was done for the most common 

 species of the blue and green tanager and honeycreeper alliance. 



Brown-capped Bush-tanager (Chlorospingus ophthalmicus). — A 

 comparatively small tanager. Sexes nearly identical in plumage: 

 largely olive above and yellow below, with brown head, conspicuous 

 triangular white patches behind eyes, white under wings (very con- 

 spicuous in flight), and grayish-bufiy throat. 



Resident in Panama. Common along the edges of forest and scrub 

 over a wide range of altitudes, both in the treetops and in very low 

 vegetation. 



Very gregarious apart from mixed species flocks. Very restless 

 and active. Very noisy ; frequently uttering loud and sharp tsit call 

 notes and mechanical-sounding rattles. 



Sooty-capped Bush-tanager (Chlorospingus pileatus). — Very simi- 

 lar to the brown-capped bush-tanager in general appearance, but head 

 largely blackish, with white postocular stripes and whitish throat. 



Resident in Panama. Usually at slightly higher altitudes than the 

 brown-capped bush-tanager. Common along the edges of forest and 

 scrub. 



Not very gregarious apart from mixed species flocks. Similar 

 to the brown-capped bush-tanager in voice, and almost equally active 

 and restless. 



Black-cheeked Warbler (Basileuterus melanogenys) . — A very tana- 

 gerlike warbler. Reminiscent of Chlorospingus in shape. Sexes nearly 

 identical in appearance : generally olive above and whitish below, with 

 black cheeks, white superciliary stripes, black stripes above white 

 superciliaries, and chestnut crown. 



Resident in Panama. Common along the edges of forest and scrub, 

 at fairly high altitudes. Usually rather low in vegetation. 



Not very gregarious apart from mixed species flocks. Very active 

 and restless. Sometimes, but not always, very noisy. 



Yellow-thighed Finch (Pselliophorus tibialis).— A rather large 

 finch. Sexes nearly identical in plumage : largely blackish, with bright 

 yellow thighs. 



Resident in Panama. Common along the edges of forest and scrub 

 over a rather wide range of altitudes. Usually occurring relatively 

 low in vegetation. 



Not very gregarious apart from mixed species flocks. Very restless 

 and active. Very noisy ; frequently uttering twittering phrases. 



Yellow-throated Bush-finch (Atlapetes gutturalis). — A rather large 

 finch. Sexes nearly identical in plumage: largely black above and 

 white below, with yellow throat and white crown stripe. 



