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Show 14 MR. P. L. SCLATER ON THE GENUS SYNALLAXIS. [Jail. 6, I have examined skins of this bird from Bogota, Venezuela (Ooering), Trinidad, Guiana, Cayenne, Ceara in N. Brazil, Bahia ( Wmherer), and other localities, and believe them to be all referable to one species. Several authors distinguish two, S. cinnamomea and S. ruficauda, the former having the back uniform with the wings, tail, and head, and the latter the back more or less fuscous, with the wings and tail rufous. But I find many intermediate forms between these two extremes. 18. SYNALLAXIS MUSTELINA. "Synallaxis cinnamomea, Gm.," Pelz. Orn. Bras. p. 37. "Synallaxis mustelina, Natt. Cat. MS.," Pelz. l.s.c. Supra unicolor castanea, remigum parte apicali intus nigricanle: subtus alba unicolor: long, tota 5, alee 2-3, caudce 2: rostro elongatiore, rectricibus acuminatis. Hab. Rio Madeira (Natt.); Pebas, E. Peru (Cast, fy Dev.). Obs. Diversa a S. cinnamomea corpore supra intensius ferrugineo et menti macula nulla, sed ejusdem formae. I cannot agree with H. v. Pelzeln in referring this species to the Certhia cinnamomea of the older authors, and have therefore adopted the M S . term mustelina as its title. Besides one of Natterer's specimens, kindly lent to m e from Vienna, I have seen only three skins, collected by Castelnau and Deville at Pebas. 19. SYNALLAXIS VULPINA. Synallaxis vulpina, Pelzeln, Sitz. Akad. Wien, xx. p. 162, & xxxiv. p. 122, et Orn. Bras. p. 37; Sclater, P. Z. S. 1859, p. 194, et Cat. A. B. p. 152. Synallaxis alopecias, Pelz. Sitz. Ak. Wien, xxxiv. p. 101. Synallaxis vulpecula, Scl. et Salv. P. Z. S. 1866, p. 184, and 1873, p. 269. Supra saturate ferruginea, uropygio fuscescente : superciliis albis : subtus pallide fusca, gutture et pectore albicantioribus : long, tota b'2, alee 2"7, caudce 2*3. Hab. Brasil. int. prov. Matogrosso, Rio Madeira et Amazonia inf. (Natt.); Amazonia superior (Bartlett). After comparing together typical specimens of the three species above mentioned I have come to the conclusion that they may be united. An Upper-Amazonian skin in m y collection agrees very fairly with the type of S. alopecias, whereas the skins from the same district upon which S. vulpecula was founded agree better with S. vulpina. At the same time further comparison should be made of specimens of this form from different localities. 20. SYNALLAXIS UNIRUFA. Synallaxis unirufa, Lafr. P. Z. S. 1843, p. 290 • Sclater P 7 S 1855, p. 141. * ' Castanea unicolor, cauda elongata, rostro et pedibus maris • lona tota 7, alee 2-4, cauda 3-8. y' Hab. Columbia int. |