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Show 1868.J MR. P. L. SCLATER ON NEW FORMICARIANS. 573 et remigum marginibus externis dorso concoloribus : macula interscapulii celata et rectricum lateralium apicibus angustis albis ; tectricibus subalaribus pallide cinereis : rostro nigro mandibula ad basin albicante, pedibus nigris : long, tota 5 5, alee 2 caudee 2*6, rostri a rictu 0 9, tarsi 0"8. Hab. ad ripas fl. Napo, reipublicee iEquatorialis. Obs. A Cercomacra cinerascente alis 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 M S . name napensis*. I have since purchased 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 distinguish this bird, not only from G. cinerascens, but also from its other allies, C. ceerulescens and C. tyrannina. 4. 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 nigricantibus albo terminatis; subtus sulphureo-flava, gutturis et pectoris lateribus parce nigro striolatis, hypochondriis virescentibus rostro nigro, pedibus fuscis : long, tota 4*2, alee 2*1, caudee 1*7, rostri a rictu 0*7, tarsi 0*8. Hab. in Amazonia superiore. Mus. P. L. S. Obs. Proxima H. flavescenti, sed superciliis et corpore toto subtus 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. flavescens (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'Orbigny 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, alis caudaque fusco-nigricantibus, alarum tectricibus maculis parvis rotundis albis terminatis; subtus schistacea unicolor, medialiter paulo dilutior : rostro nigro, pedibus pallide fuscis : long, tota 6*2, alee 2*7, cauda; 2*2, rostri a rictu 1*0, tarsi 1*1. Hab. in Surinamo, ad ripas fl. Maroni (C. Bartlett). 1 have a single indifferent skin of this Ant-Thrush, for which I * Cf. P. Z. S. 1866, p. 186. |