SCLERURUS. 91 



and nearly stra-ight. The wing is rounded, the third, fourth, and 

 fifth primaries longest and equal, the second shorter than the 

 fifth but longer than the sixth, and the first about equal in 

 length to the eighth. The tail is stiffened, rounded at the tip, 

 and rather less than two-thirds the length of the wing. The tarsus 

 is proportionately short, being about equal in length to that of the 

 exposesd culmen. Coloration : male and female similar. 



Key to the Species. 



A. Throat fawn-colour. 



a. Larger, wing more than 82 mm., culmen 



more than 20 mm S. caudacutus, p. 91. 



h. Smaller, wing less than 82 mm., cuhnen 



less than 20 mm S. rufigularis, p. 92. 



B. Throat bright ferruginous ; culmen 26 mm., 



wing 80 S.m. macconnelli,-^. 92. 



406. Sclerurus caudacutus. 



Black-tailed Leafsorapee. 



ThamnopMlus caudacutus Vieill. N. Diet. d'Hist. Nat. iii. p. 310, 1816 



(Cayenne). 

 Sclerurus caudacutus Salvin, Ibis, 1885, p. 419 (Bartica Grove, Cama- 



cusa, Merume Mts., Atapurau River) ; Sclater, Cat. B. Brit. Mus. 



XV. p. 116, 1890 (Mermne Mts., Bartica Grove, Attapurow River, 



Camacusa, Carimang River) ; Braboiu'ne & Chubb, B. S. Amer. i. 



p. 246, no. 2497, 1912. 

 Sclerurus caudacutus caudacutus Hellm. Nov. Zool. xiv. p. 66, 1907. 



Adult male. General colour above and below umber-brown, 

 paler and more rufescent on the lores, fore part of the head, sides 

 of the face, and fore-neck ; chin and throat paler and inclining to 

 fawn-colour ; inner webs of the flight-quills somewhat darker 

 than the outer ones ; tail blackish; under wing-coverts rufescent ; 

 quills below greyish brown ; lower aspect of tail similar to that 

 above. 



Total length 161 ram., exposed culmen 20, wing 91, tail 68, 

 tarsus 23. 



The bird described was collected on the Ituribisi River in 

 August 1909. 



Adult female,' Similar to the adult male. Wing 89 mm. 



An immature bird from the Anarica River is similar to the 

 adult but everywhere less bright in colour. 



Breeding-season. Unknown in British Guiana. 



Kest. Unrecorded in British Guiana. 



