(3) 



a. T. albi pectus albipectus (Cab.). British Guiana, Cayenne ; Caura River, in 



East Venezuela ; North Brazil : Rio Branco, and Lower Amazonia from 

 Para to Barra do Bio Madeira. 

 Upper parts warm rnfescent brown ; throat white, rest of under surface buff, 

 deepening into ochraceona on flanks and crissum. 

 Wing, $ 63—138, ? 60—64 ; tail 46-52 mm. 



Examined : 1 ad. Cayenne (type of species) ; 4 Forte do Rio Brauco ; 4 British 

 Guiana; 1 Pani; 1 Santarem ; 12 Caura River ; 1 Barra do Rio Madeira. 



b. T. albipectus hjpoleucua Berl. & Hart. Middle Orinoco from Ciudad Bolivar 



to Atnre (for characters see Nov. Zool. ix. 1902. p. 6). 

 Examined : 16 specimens (including the type). 



c. T. albipectus bogotensis Hellm. On the upper Orinoco : Perico, Maipures ; 



and in Bogota collections. 



Differs from a and b by its much brighter rufous-brown upper parts, and by 

 having the whole lower surface (except the white throat) deep ochraceous, passing 

 into rnfescent brown on flanks. 



Wing 65—69 ; tail 48—52 ; bill m— 19 mm. 



Examined : 5 Bogota skins (including the type) : 1 $ ad. Perico, 1 $ ad. 

 Maipures. 



d. T. albipectus venezuelanus (Cab.) 



Thryothorus venezuelanus Cabanis, .l/«.«. Heinean. i. (185U) p. 78 (Venezuela). 



Near Puerto Cabello, North Venezuela. 



Differs from T. a. bogotensis by its duller and darker upper parts, distinctly ashy 

 grey sides of the neck, and by having the foreueck and middle of the breast much 

 paler, buffy ochraceous. 



Wing 60, 64 ; tail 40, 43 ; bill 16, 17J mm. 



Examined : 1 ? ad., S. Esteban, near Puerto Cabello (Mas. H. v. Berlepsch) ; 

 1 av. imm. from Venezuela (type of T. venezuelanus Cab.), kindly lent by 

 Oberamtmann Heine. 



The distinctly ashy grey sides of the neck render this form easily recognisable 

 among its affine.s. 



e. T. albipectus snbsp. North-east aud Central Peru ; and on the Rio Jurna 



in North-west Brazil. Occasionally found in Bogota collections. 



Differs from T. a. venezuelanus by the much duller, dark olive-brown colour 

 of the pileum (without any rnfescent tinge), aud by having the whole under surface 

 (except the white throat) deep ochraceous, as in T. a. bogotensis, from which it 

 ma)', however, be distinguished by its much shorter tail, shorter bill, and the 

 colour of the pileum, which in bogotensis is bright rufous brown, like the back. 

 There is scarcely any grey on the sides of the neck. 



Wing 60—65 ; tail 40-44 ; bill 16—17 mm. 



Examined : 4 Nauta, N.E. Peru ; 1 ¥ ad. Upper Ucayali ; 3 3 S ad. 

 Chuchurras, Huanuco, Peru ; 2 Rio Jama ; 2 Bogota collections. 



f. T. albipectus rufiventris Scl. Central Brazil : Goiaz and Mattogrosso south 



to the Rio Grande, northern frontier of S. Paulo. 

 For characters see I.e. 



Examined : 1 c?, 2 ¥ ¥ , Cuyaba ; 2 cJ S, Goiaz ; 1 d ad. Bio Paranahyba, Goiaz ; 

 1 $ ad. Leopoldiua, Rio Araguay, Goiaz ; 1 ¥ ad. Bio Grande, S. Paulo. 



