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Hab. North-eastern Peru, iiortli bank of the Maranon ; Nauta (Bartlett), Pebas, 

 Rio Tigre (Hanxwell), Iqnitos (Whitely) ; Eastern Ecnador : Rio Napo ( Verreaus), 

 Archidoua (Goodfellow), Catapino (Petit), Sarayacn (Buckley) ; N.W. Brazil, 

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

 (Natterer). 



Adult. — Diflfers from T. c. corai/a and T. c. amuzonicus by much darker chestnnt- 

 brown njiper parts ; jiale fnlvons (instead of greyish brown) tail-bands ; by having 

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

 snifiision on the chest, the sides of tlie body alone being dark rnsset brown. Size 

 generally less, especially the bill weaker and slenderer. 



Material. — 5 SS, ^ ??, Nauta (including the type), in British and Tring 

 Mnsenms : 1 ? ad., Pebas, Brit. Museum; 2 S3 ad., Rio Tigre, Mus. H. v. Ber- 

 lepsch ; I c? ad., Catajiiuo, 1 ? imra., Archidoua, in Tring Museum ; 3 ad. (not sexed), 

 Saraya(,'n, in Brit, and Berlepsch Museums ; A S S ad., 1 ? ad., 1 ? jr., Upper Rio 

 Negro (Marabitanas, Ii^anna, Castanheiro), Natterer coll., in Vienna and Munich 

 Museums. 



Specimens from different localities average as follows : 



Four males from Nauta . . Wing 63-65 ; tail 55-60 ; bill [damaged]. 



Two females from Nauta . . Wing 59, 60 ; tail 50 ; bill [damaged]. 



Two males from Rio Tigre' . . Wing 60, 64 ; tail 51, 50 ; bill 17 mm. 



Two males from Eastern Ecuador Wing 62, 65 ; tail 55, 57i ; bill 18 mm. 



One female from Eastern Ecuador AVing 59 ; tail 53 ; bill 16 mm. 

 Four males from the Upper Rio 



Negro Wing 58-61 ; tail 50-55 ; billI5-16 mm. 



Two females from the Ui)per Rio 



Negro Wing 57 ; tail 47 ; bill 14A-15 mm. 



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

 Cayenne are much deeper, chestnut brown above, and have the median portion 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. corai/a, from whicli 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. kerberti, nor dull greyish 

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

 with liglit tip. 



7. Thryothorus coraya cauretiHi.^ Berl. and Hart. 



T/iri/oilioriiji griKeipecius caurensis Berlepsch .ind Hartirt, Nni-. Ziml. i.x. p. 7 (1902. — Nicare, 

 Caura River, East Venezuela). 



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



