18G8.J MR. p. L. SCLATER ON NEW FORMICARIANS. 5/3 



et remigum marginibus externis dorso concoloribus : macula 

 interscapulii celata et rectricum lateralium apicibits angustis 

 albis ; tectricibus subalaribus pallide cinereis : rostro nigra man- 

 dibula ad basin albicante, pedibus nigris : long, tola 5 it, alee 2 6, 

 caudcB 2'6, rostri a riciu 09, tarsi 0'8. 

 Hab. ad ripas fl. Napo, reipublicse jEquatorialis. 

 Obs. A Cercomacra cinerascente a.\\s omnino immaculatis et caudae 

 rectricibus angustius albis distinguenda. 



Upon obtaining from Mr. E. Bartlett's collection specimens of the 

 true Cercomacra cinerascens (which I had originally described, 

 P. Z. S. 1857, p. 131, from skins in the British Museum) I at once 

 recognized their complete distinctness from the present bird, and 

 assigned to the latter the MS. name napensis*. I have since pur- 

 chased of a dealer a second example of this species, which by its 

 make appears to be from Cayenne. 



The absence of white markings on the wings will serve to distin- 

 guish this bird, not only from C. cinerascens, but also from its other 

 allies, C. ccerulescens and C. tyrannina. 



A. Hypocnemis hypoxantha. (Plate XLIII.) 



Supra olivacea ; capite nigro, striga verticali elongata alba ; loris 

 et superciliis ad nucham productis flavis : alarum tectricibus 

 nigris albo terminatis ; cauda olivacea, rectricum apicibus nigri- 

 cantibus albo terminatis; sublus sulphureo-Jlava, gutturis et pec- 

 toris laterihus parce nigro striolatis, hypochondriis virescentibus : 

 rostro nigro, pedibus fuscis : long, tota 4*2, al<B 2*1, cauda: 1*7, 

 rostri a rictu O'Z, tarsi 0"8. 

 Hab. in Amazonia superiore. 

 Mus. P. L. S. 



Obs. Proxima H . Jlavescenti, sed superciliis et corpore toto sub- 

 tus sulphureo-flavis dignoscenda. 



Of this well-marked species of Hypocnemis I have lately acquired 

 a single specimen from a French dealer. Its colouring above closely 

 resembles that of H . Jlavescens (Sclater, P. Z. S. 1864, p. 609) ; but 

 the lengthened superciliaries are bright yellow like the breast, and 

 the present bird has no trace of rufous on the flanks and belly, 

 M. Jules Verreaux tells me that this species was obtained by D'Or- 

 bigny during his Bolivian travels ; but it does not appear to have been 

 noticed in the ornithology of that author's well-known ' Voyage.' 



5. Heterocnemis simplex. 



Nigricanti-schistacea, alts caudaqtie fusco-nigricantibus, alarum 

 tectricibus maculis parvis rotundis albis terminatis ; subtus 

 schistaceu unicolor, medialiter pauJo dilutior : 7'ostro nigro, 

 pedibus pallide fuscis : long, tota 6 "2, alce2'7, caudce 2 2, 

 rostri a rictu 10, tarsi I'l. 



Hab. in Surinamo, ad ripas fl. Maroni (C Bartlett). 



1 have a single indifl'erent skin of this Ant-Thrush, for which I 

 - Cf. V. Z. S. 186fi, p. 186. 



