482 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



decidedly less than half the length of exposed culmen, and nearly 

 twice its depth at same point, its lateral outlines faintly concave near 

 middle portion, faintly convex terminally; exposed culmen equal to 

 middle toe with claw, very distinctly ridged, nearly straight basally but 

 gently decurved for near terminal half, the tip of maxilla minutely 

 uncinate; gonys decidedly longer than mandibular rami, slightly con- 

 vex; maxillary tomium faintly concave anteriorly, minutely notched 

 subterminally. Nostril exposed, longitudinally oval or elliptical, 

 margined above by distinct membrane. Rictal bristles moderately 

 large, strong; feathers of chin and malar and frontal antiae with dis- 

 tinct bristly points. Wing moderate, much rounded, the longest pri- 

 maries exceeding distal secondaries by less than length of middle toe 

 without claw; sixth, seventh, and eighth primaries longest and equal, 

 ninth intermediate between fifth and sixth, tenth (outermost) equal 

 to second. Tail about seven-eighths as long as wing (slightly longer 

 than distance from bend of wing to end of distal secondaries) , slightly 

 rounded, the rectrices rather narrow, with broadly rounded tip. Tar- 

 sus long and slender, twice as long as middle toe without claw, one- 

 third as long as wing, its scutellation typically exaspidean but with 

 a separate series of longitudinal scutella along upper posterior margin 

 of outer side of tarsus, the acrotarsial divisions very distinct; basal 

 phalanx of middle toe united for entire length to outer toe, for more 

 than half to inner toe; lateral toes, equal, reaching, without claw^s, to 

 slightly beyond middle of subterminal j^halanx of middle toe; hallux 

 shorter than lateral toes but distinctly stouter, its claw nearly as long 

 as the digit; all the claws rather long and slender, moderately curved, 

 sharp, moderately compressed. 



Coloration. — Above plain dark olive or sooty brown, the wings 

 dusky wath paler edgings and two broad pale grayish fulvous bands; 

 beneath dull light, olive-yellowish, paler on tlu'oat, the chest and sides 

 shaded wath olive. 



Nidijication. — (Unknown.) 



Range. — Cocos Island, off Gulf of Panama. (Monotypic.) 



NESOTRICCUS RIDGWAYI Townsend. 

 COCOS ISLAND FLYCATCHER. 



Ad lit male. — Above plain sooty olive, the lower rump and upper 

 tail-coverts decidedly paler (nearly hair brown or broccoli brown); 

 wings dusky with paler edgi.igs, the middle and greater coverts rather 

 broidly tipped with pale huffy brown or pale dull brownish buffy, 

 forming tv, 3 distinct bands; inner secondaries ("tertials") broadly 

 edged and terminally margined with pale buffy brown or brownish 

 buff; tail dusky, becoming paler (clear haii" brow^n) on lateral rectrices, 

 all the rectrices edged with pale grayish brown or olive; upper portion 

 of lores and a fairly distinct orbital ring pale grayish buffy or dull 



