802 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



slightly concave in middle portion, but very strongly and abruptly 

 decurved terminally, the tip of maxilla very strongly uncinate ; gonys 

 rather strongly convex, much longer than mancHbular rami; basal 

 width of interramal space much less than its length; maxillary 

 tomium straight or faintly convex, distinctly notched sub terminally ; 

 mandibular tomium straight or faintly concave, also more or less dis- 

 tinctly notched near tip. Nostril (partly hidden by antrorse latero- 

 trontal bristles) rather large, broadly oval. Rictal bristles very 

 strongly developed, the bristh" points of loraland antrorse latero-frontal 

 plumules scarcely less so. Wing rather short, rounded, the longest 

 primaries exceeding secondaries by much less (sometimes by less 

 than half) the length of exposed culmen; sixth, seventh, and eighth 

 primaries longest, the tenth shorter than third (sometimes shorter 

 than second). Tail about as long as wing to end of secondaries, even 

 or slightly rounded or double-rounded, the rectrices rounded or 

 slightly pointed at tip. Tarsus about as long as exposed culmen, more 

 than one-fourth as long as wing, the planta tarsi with scutella only 

 along the median or posterior line ; middle toe, with claw, shorter than 

 tarsus, adherent for greater part to outer toe, for about half its length 

 to inner toe; outer toe, without claw, reaching to sliglitly beyond 

 mid<;lle of subterminal phalanx of middle toe, the inner toe decidedly 

 shorter; hallux about as long as inner toe, decidedly stouter, its basal 

 pad (tylarus) moderately expanded and flattened. 



Plumage and coloration. — Contour feathers broad, soft, and l)leiitled, 

 those of the pileum elongated, narrower, and rather distinctly defined, 

 forming, when erected, a bushy crest. Color more or less rufescent or 

 tawny, sometimes with yellowish on rump or under parts (or both), 

 the throat and chest sometimes streaked; sexes alike or nearly so. 



Nidifi cation. — (Unknown ?) 



Range. — Southern Mexico to southeastern Brazil, Bolivia, and 

 western Ecuador. (About twenty-five species and subspecies.) 



KEY TO THE SPECIES AND SUBSPECIES OF ATTILA. 



a. Back and scapulars wholly olive-green; tips of greater and middle wing-coverts 

 light olive or grayish. 

 b. Throat and chest narrowly streaked with yellow and without dusky streaks; sides 

 and flanks merely tinged with yellow; wing-liands light ])rownish olive; olive- 

 green of pileum and back brighter; tail more grayish brown; larger (wing of 

 male 82.5, tail 64, exposed culmen 19, tarsus 23). (Lower Amazon Valley. ) 



Attila viridescens (extralimital)." 



66. Throat and chest broadly streaked with yellow, the olive streaks much darker, 



the throat with narrow blackish streaks; sides and flanks extensively and 



nearly uniformly yellow; wing-bands olive- whitish ; olive-green of pileum and 



"■Attila viridescens Ridgway, Proc. U. S. Nat. Mus., x, sig. 33, Aug. 6, 1888, 522 (Dia- 

 mantina Mts., near Santarem, Lower Amazon; coll. U. S. Nat. Mus.); Chapman, 

 Auk, viii, 1891, 25 (Santarem; crit.). 



