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Had. North-eastern Pern, north bank of the Maraiion ; Nauta (Bartlett), Pebas, 

 Rio Tigre (Hanxwell), Iquitos (Whitely) ; Eastern Ecuador : Rio Napo (Verreaux), 

 Archidona (Goodfellow), Catapino (Petit), Sarayacu (Buckley) ; N.W. Brazil, 

 Rio Negro district : Marabitanas, R. Icanna, between S. Isabel and Castanheiro 

 (Natterer). 



Adult. Differs from T. c. coraya and T. c. amazonicus by much darker chestnut- 

 brown upper parts ; pale fulvous (instead of greyish brown) tail-bands ; by having 

 the lower surface posterior to the throat distinctly ashy grey, without any brownish 

 suffusion on the chest, the sides of the body alone being dark russet brown. Size 

 generally less, especially the bill weaker and slenderer. 



Material 5 c?<?, 2 ? ?, Nauta (including the type), in British and Tring 

 Museums : 1 ? ad., Pebas, Brit, Museum; 2 c?<? ad., Rio Tigre, Mus. H. v. Ber* 

 lepsch ; 1 cf ad., Catapino, 1 ? imm., Archidona, in Tring Museum ; 3 ad. (not sexed), 

 Sarayacu, in Brit, and Berlepsch Museums; 4 c?c? ad., 1 ? ad., 1 ? jr., Upper Rio 

 Negro (Marabitanas, Icanna, Castanheiro), Natterer coll., in Vienna and Munich 

 Museums. 



Specimens from different localities average as follows : 



Four males from Nauta 

 Two females from Nauta 

 Two males from Rio Tigre . 

 Two males from Eastern Ecuador 

 One female from Eastern Ecuador 

 Four males from the Upper Rio 



Negro 



Two females from the Upper Rio 



Negro ..... 



Wing 63-65 ; tail 55-60 ; bill [damaged]. 



Wing 59, 60 ; tail 50 ; bill [damaged]. 



Wing 60, 64 ; tail 51, 56 ; bill 17 mm. 



Wing 62, 65 ; tail 55, 57| ; bill 18 mm. 



Wing 59 ; tail 53 ; bill 16 mm. 



Wing 58-61 ; tail 50-55 ; bill 15-16 mm. 



Wing 57 ; tail 47 ; bill 14|-15 mm. 



Observations. The typical Peruvian birds when compared with a series from 

 Cayenne are much deeper, chestnut brown above, and have the median p6rtion of the 

 breast and abdomen more decidedly ashy grey, the chest being by no means clouded 

 or washed with brownish. The sides of the belly are extensively and dark rufous 

 brown, as in T. c. coraya, but the upper tail-coverts are much darker, without traces 

 of dusky barring. There is a very distinct white superciliary stripe, also the sides 

 of the head are strongly streaked with white. Birds from Eastern Ecuador are 

 practically identical with the Peruvian ones. The series from the Rio Negro, how- 

 ever, differ slightly : they are smaller, with the bill notably so, and the upper parts 

 are still deeper chestnut brown. In the small size they agree with T. c. caurensis, 

 but have much more rufous-brown on the flanks. In a previous communication on 

 this subject I have referred them to T. c. coraya, from which they are, however, 

 obviously distinct. 



All the above examples are distinguished by having the tail-bands light 

 fulvous (that is, neither bright cinnamon as in T. c. herberti, nor dull greyish 

 brown as in T. c. coraya). The upper mandible is black, the lower one horn-grey 

 with light tip. 



7. Thryothorus coraya caurensis Berl. and Hart. 



Thryothorus griseipectus caurensis Berlepsch and Hartert, Nov. Zool. ix. p. 7 (1902. Nicare, 

 Caura River, East Venezuela). 



Hal). Eastern Venezuela, Caura Valley : Nicare, La Pricion (E. Andre'). 



