24 REVIEW OF THE GENUS SCLERURUS RIDGWAY. 



8. umbretta is a strongly characterized species, easily distinguished 

 from its nearest allies by the combination of bright chestnut rump and 

 upper tail-coverts, with bright russet or tawny-rufous chest and olive- 

 brown under parts, and is apparently entirely confined to Brazil south 

 of the Amazon. 



Sclerurus albogularis Swains. 



Sclerurm albogularis Swains., B. Bras., 1834-41, pi. 87; Zool. Jour., 1827.— Jard., 

 Aim. and Mag. N. H., xix, 1847, 80 (Tobago).— Scl. & Salv., P. Z. S., 1868, 

 6-27. 630 (Venezuela). 



Sp. Char. — Somewhat like 8. umbretta, but lower throat plain light 

 gray, upper throat and chin dull white, without distinct squamatlons, 

 chest olive-tawny, and other under parts dull grayish olive. 



Hab. — Venezuela and Tobago. 



Adult (coll. P. L. Sclater, Venezuela, 1868; Goering). — Pileurn and 

 hind-neck, brownish olive; back similar, but slightly browner, becoming 

 clear bistre posteriorly aud changing to bright chestnut on rump and 

 upper tail-coverts ; tail dull brownish black, browner basally, especially 

 on edges of the feathers. Chin and upper throat dull white, some of 

 the feathers with very faint darker margins; lower throat plain dull 

 light gray, the cheeks similar, but tinged with olive-brown ; chest tawny- 

 olive, approaching raw-umber; rest of under parts grayish olive, the 

 under tail-coverts rusty brown (intermediate between vandyke-brown 

 and burnt-umber). Upper mandible black, the tip and edges brown- 

 ish; lower mandible with basal half whitish, terminal half brownish; 

 legs aud feet dusky brown. Length (skin), 6.50; wing, 3.40; tail, 2.50; 

 exposed culmen, .80; tarsus, .85; middle toe, .77. 



A specimen in the U. S. National Museum collection from Tobago 

 (No. 74884, April, F. A. Ober) agrees exactly in coloration with the Ven- 

 ezuela specimen described above. It measures as follows: Length be- 

 fore skinning, 7.25 ; skin, 6.30; wing, 3.50; tail, 2.50; exposed culmen, 

 .82 ; tarsus, .80 ; middle toe, .70. 



Sclerurus canigularis, Ridgw. 



Sclerurus canigularis Ridgw., Proc. U. S. Nat. Mus., xi, 1889, 542. 



Sp. Char. — Somewhat like 8. umbretta (Licht.), but much smaller 

 and darker in color, the chest dark chestnut and the throat, abruptly, 

 deep dull ash gray, fading into grayish white anteriorly. 



Hab. — Costa Rica. 



Adult male (type, No. 115038, U. S. Nat. Mus., Turrialba, Costa Rica, 

 August, 1886; J.J.Cooper). — Prevailing color of upper parts plain 

 dark sooty brown, overlaid on hind-neck, back, scapulars, wing-coverts, 

 and tertials, with a wash of burnt-umber, this changing to dark chest- 

 nut on rump and upper tail-coverts ; tail brownish black. Sides of head 

 dull grayish brown, this changing gradually to dull grayish white on 

 chin and upper throat and to dull ash gray on lower throat; chest deep 

 chestnut brown (abruptly defined against gray of throat), this changing 



