494 BULLETIN 50;, UNITED STATES NATIONAL MUSEUM. 



Bill much shorter than head, broadly wedge-shaped in vertical 

 profile, depressed basalh^, its width at nostrils equal to at least one 

 and one-half times its depth at same point, its lateral outlines nearly 

 straight; exposed culmen about as long as middle toe without claw, 

 indistinctly ridged, decurved nearly from base, the tip of maxilla 

 distinctl}^ but not abruptly uncinate; gonysmuch longer than mandib- 

 ular rami, nearly straight; maxillary tomium faintly concave (more 

 strongly so terminally), with distinct subterminal notch. Nostril 

 exposed, rather large, roundish or broadly oval, with membrane 

 above posterior half and behind. Rictal bristles very strongly de- 

 veloped (as long as bill), the feathers of chin with fine, those of the 

 frontal anti» with strong, bristl}^ ]:)oints. Wing moderate, with 

 longest primaries exceeding secondaries by rather less than length 

 of exposed culmen; sixth, seventh, and eighth primaries longest, 

 the ninth and fifth, successiveh^, a little shorter, the tenth (outer- 

 most) shorter than secondaries. Tail nearly four-fifths as long as 

 wing, very slightly double-rounded, the rectrices rather narrow. 

 Tarsus less than one-third as long as wing, slender, its scutellation 

 typically exaspidean, but divisions of acrotarsium indistinct or 

 obsolete (the tarsus practically "booted"); middle toe, without claw> 

 slightlv more than half as long as tarsus, the whole of its basal and 

 about half of its second phalanx united to outer toe, its basal phalanx 

 more than half united to inner toe; outer toe, without claw, reaching 

 about to middle of subterminal phalanx of middle toe, the inner toe 

 decidedly shorter (barely extending past second joint of middle toe); 

 hallux longer than inner toe, stouter, its claw shorter than the digit; 

 all the claAvs moderately curved, slender, sharp, much compressed. 



Ck)loration. — Above plain grajnsh anteriorly, passing into ochrace- 

 ous on wings and ochraceous-rufous on tail; beneath plain ochi^ace- 

 ous-buff , paler on throat ; no crest nor colored spot on crown. 



Nidijlcation. — (Unknown.) 



Range. — Costa Rica to Guiana and Peru. (Alonotypic.) 



KEY TO THE SUBSPECIES OF TERENOTKICCUS ERYTHRURUS. 



a. Throat more grayish; pileum, hindneck, and hack gray: under parts paler. (British 

 (iuiana; Cayenne; Surinam. ). .Terenotriccus erythrurus erythrurus (extralimital)« 



aa. Throat pale tawny or huffy, hecoming dull whitish toward chin; pileum, hindneck, 

 and 1)ack grayish olive; under i)arts deep tawny. (IlDnduras to Peru.) 



Terenotriccus erythrurus fulvigularis (p. 495) 



aMijiohius erythrurus Cabanis, in Wiegmann's Archiv. fiir Naturg., 1844, i, 249, pi. 5, 

 fig. 1 (Guiana); in Schomburgk's Reise Brit. Guiana, iii, 1848, 701; Sclater, Cat. Birds 

 Brit. Mus., xiv, 1888, 203, part (Bartica Grove, Camacusa, and Carimang R., British 

 Guiana; Albina R., Surinam; Rio Capim, Para, Lower km&zon) .— Tcrcnotriccv s ery- 

 thrurus Ridgway, Proc. Biol. Soc. Wash., xviii, Sept. 2, 1905, 207. 



I have not been able to make a direct comparison of this form with T. c./ulrlgulwis, 

 no specimen being at the present time available. 



