314 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Genus EUBUCCO Bonaparte. 



Eubwxo Bonaparte, Consp. Av., i, 1850, 142. (Type, Capita richardsoni Gray.) 

 Ahelterus<^ Heine, in Heine and Eeichenow, Nom. Mus. Hein. Om., 1890, 227. 

 (New name to replace Eubucco Bonaparte on grounds of purism.) 



Rather small Capitonidae (length about 130-160 mm.) with rather 

 slender, compressed bill, relatively narrow mesorhinium, oval to 

 nearly linear nostrils, tail less than two-thirds as long as wing, outer- 

 most (tenth) primary broad and about half as long as ninth, back, etc., 

 plain green or olive-green, the sexes with coloration of head and neck 

 radically different. 



Bill about as long as head, rather slender (its depth at nostril equal to 

 not more than half the length of exposed culmen), very much broader 

 than deep at base (width at base at least one and a half times as great 

 as depth at same point), compressed anteriorly; culmen rounded (or 

 at least not distinctly ridged), nearly straight for basal half or more, 

 gently convex terminally, the tip of maxilla pointed and more or less 

 strongly decurved, but not uncinate; gonys about as long as man- 

 dibular rami or slightly longer, nearly straight, ascending terminally, 

 not ridged; lateral base of maxilla more or less tumid or turgid, espe- 

 cially the upper-posterior margin; tomia perfectly smooth, the max- 

 Ulary tomium rather strongly though gradually deflected basaUy. 

 Nostril small, more or less narrow, partly concealed by, or at least in 

 contact with (posteriorly) feathering of frontal antiae, from which 

 spring several rather long but very slender antrorse bristles, the chin 

 and rictal region with similar but rather smaller bristles. Orbital 

 region partly naked. Wing rather short, very concave beneath, much 

 rounded; longest primaries exceeding secondaries by much less than 

 length of exposed culmen, the sixth and seventh or fifth, sixth, and 

 seventh primaries longest, eighth shorter than fourth (sometimes 

 shorter than second), ninth much shorter than first, the tenth (outer- 

 most) about half as long as ninth, normally broad. Tail more than 

 two-thirds as long as wing, the outermost pair of rectrices more than 

 haK to slightly more than two-thirds as long as middle pair. Tarsus 

 slightly shorter to longer than culmen (from base), decidedly longer 

 than longest toe with claw. 



Coloration. — Above (except sometimes head and neck) plain green 

 (varying from bluish green to olive-green), under parts with more or 

 less of yellow, the flanks striped with green or greenish dusky; adult 

 males with at least pileum red and a bluish band across hindneck; 

 adult females without red on head. 



Range. — Costa Eica to Bolivia and eastern Peru. (About eight 

 species and subspecies.) 



"■ 'Apihepoc, silly, stupid. (Richmond.) 



