14 MR. P. L, SCLATER ON THE GENUS SYNALLAXIS. [Jail. 6, 



I have examined skins of this bird from Bogota, Venezuela 

 (Qoering), Trinidad, Guiana, Cayenne, Ceara in N. Brazil, Bahia 

 ( Wucherer), and other localities, and believe them to be all referable 

 to one species. Several authors distinguish two, 5. 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, 6m.," Pelz. Orn. Bras. p. 37. 



"Synallaxis mustelina, Natt. Cat. MS.," Pelz. l.s.c. 



Supra unicolor castanea, remigum parte apicali intus nigricante : 

 subtus alba unicolor: long, tota 5, alee 2*3, caudee 2: rostro 

 elongatiore, rectricibus acuminatis. 



Hab. Rio Madeira (Natt.) ; Pebas, E. Peru (Cast. $• Dev.). 



Obs. Diversa a S. cinnamomea corpore supra intensius t'errugineo 

 et menti macula nulla, sed ejusdem formse. 



I cannot agree with H. v. Pelzeln in referring this species to the 

 Certhia cinnamomea of the older authors, and bave therefore adopted 

 the MS. term mustelina as its title. Besides one of Natterer's 

 specimens, kindly lent to me from Vienna, I have seen only three 

 skins, collected by Castelnau and Deville at Pebas. 



19. Synallaxis vulpina. 



Synallaxis vulpina, Pelzelu, 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 alop>ecias, 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 : super ciliis albis : 

 subtus pallide fusca, gutture et pectore albicantioribus : long, tota 

 5'2, al<e 2*7, caudee 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 my collection agrees very 

 fairly with the type of 5. alopecias, whereas the skins from the 

 same district upon which S. vulpecula was founded agree better 

 with £. 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. Z. S. 

 1855, p. 141. 



Castanea unicolor, cauda elongata, rostro et pedibus nigris : long. 



tota 7, alee 2 - 4, cauda 3 - 8. 

 Hab. Columbia int. 



