53 [Vol. xiv. 



and lower surface (lark slate-grey, like the back. Axillaries 

 somewhat paler grey, the inner webs of the quills broadly 

 edged with white ; under tail-coverts with narrow white 

 apical margins : bill blackish, base of the lower jaw light 

 plumbeous. Wing 67, tail 55, tarsus 22, bill 17f mm. 



Hab. La Aroya, Inambari valley, Marcapata district, 

 S.E. Peru, elev. 3000 ft. 



Typus in Mas. Tring : d 1 , 22.4.01 (G. Ockenden Coll., no. 95). 



This species has no very near ally. It differs from D. ar- 

 desiacus, Scl. & Salv., in lacking the blackish throat, in 

 having much broader white tips to the tail-feathers, and the 

 upper wing-coverts tipped with white. It is not quite a 

 typical member of the genus Dysithamnus, the bill being 

 somewhat broader at the base and the tail much graduated ; 

 but as in the latter respect some of the species, especially 

 D. murium (Scl. & Salv.), come very near to it, I think it 

 better to place it in that genus than to create a new one for 

 its reception. 



Thamnophilus paraguayensis, n. sp. 



6 fere ad. Crown black, back grey ; the feathers of the 

 middle portion broadly white at the base, and mixed with 

 black ; upper tail-coverts black, tipped with white. Wing- 

 coverts black with broad white margins at the tips ; bend of 

 wing white ; quills black, outwardly margined with whitish, 

 the secondaries more broadly so ; tail-feathers black, all 

 except the central ones with broad white tips, and the outer- 

 most pair with a long white margin on the outer web ; lores 

 whitish ; sides of the head grey, with whitish shaft-lines ; 

 lower parts white : bill black, lower mandible somewhat 

 paler. Wing 68-72, tail 64, culmen 16-17 mm. 



Hab. Colonia Risso, Rio Apa, in Northern Paraguay. 



Typus: Mus. Tring: S fere ad. (Borelli Coll., no. 398). 



This bird has been identified by Count Salvadori as 

 Th. catrulescens, Vieill., but it differs from a series of that 

 species from Paraguay (Foster coll.) as well as from all the 

 other species of the Th. ncevius-grouo to which it belongs, 

 in having the under surface whitish instead of plumbeous. 



