756 MESSRS. SCI.ATER AND SALVIN ON [Juue 27, 



(59.) Thamnophilus murinus. 



Thamnophilus murinus, Natt. MS. sp. no. 923. 



Xeberos. Specimens of both sexes of this species, of which 

 Sclater has three examples in his collection under Natterer's MS. 

 name. They may be characterized as follows : — 



Schistaceus, subtus valde dilutior, ventre medio pcene albo : ma- 

 cula dorsi medii celata alba : alis fuscescenti-ochraceis, tnacu- 

 lis tectricum terminalibus albis: eauda schistaceo-nigra, api- 

 cibus rectricum anguste albis : long, tota 5*3, alee 2'4, caudcB 

 2'1, rostri a rictu 0'8. 



Fcem. Fusca; subtus dilute ochracea, medialiler albescens : pileo 

 alis et Cauda riifescentibus : maculis tectricum terminalibus 

 ochracescentibus. 



Hab. Cayenne (3/ms. P.L. S ); Marabitanas et Barra do Rio Negro 

 (Natterer} ; Xeberos {Bartlett). 



Obs. Species parva; affinis Th. ccerulescenti et Th. amuzonico, 

 sed sane distincta. 



(02.) Dysithamnus schistaceus, D'Orb. 



Yurimaguas and Chyavetas. This appears to be the true Tham- 

 nophilus schistaceus of D'Orbigny (figured Voy. t. 5. f. 1 under the 

 name Th. fuUginosus); but it is not the same as the species referred to 

 by Sclater in his articles in P. Z. S. (1858, pp. 66, 222) and American 

 Catalogue. The latter is distinguishable by its white dorsal spot, 

 darker cinereous colour below, and the narrow white terminations of 

 the tail-feathers. For this species, of which one female skin is like- 

 wise in Bartlett' s collection, we propose the new name Dysithamnus 

 ardesiacus. 



(66.) Myrmotherula h^matonota, Sclater, P. Z. S. 1858, 

 p. 235; Sclat. et Salv. P. Z. S. 1866, p. 185. 



Xeberos and Chyavetas. Several specimens of this interesting 

 species, and of each sex. 



(68.) Myrmotherula cinereiventris. 

 Myrmotherula cinereiventris, Sclater, MS. 



S . Cinerea, paulo pallidior, unicolor : tectricum alarum apicibus 

 nigris albo terminatis : cauda nigro-cinerea, apice vix palles- 

 cente : long, tota 3*5, alts 2' 1 , caudce 1" 1 . 



5 . Suprq cinerea, capitis lateribus et corpore subtus cinnamomeis. 



Hab. Cayenne {Mxis. P.L.S.); Surinam (C. Bartlett); Rio 

 Napo (Ferreaux) ; Eastern Peru, Chyavetas (E. Bartlett). 



Obs. Species, aflSnis 31. axillari et ejusmodi formse, sed corpore 

 toto subtus cinereo ah aliis prorsus notabilis. 



Mr. E. Bartlett' s collection contains many examples of this spe- 

 cies, which appears to be undescribed. Sclater's collection contains 

 several skins of it from various localities. 



