18GG.J COLLECTED ON THE RIVER UCAYALI. 177 



have been already recorded as met with in the series from the Rio 

 Napo, of which Mr. Sclater has given an account in the Society's 

 ' Proceedings' for 1858* ; and others are to be referred to the species 

 described by D'Orbigny from tbe lower woodlands of the adjoining 

 republic of Bolivia. 



Although, therefore, as has been already stated, no complete ac- 

 count has yet been published of the birds of Eastern Peru, it will be 

 seen, by the subjoined catalogue, that by far the greater portion of 

 Mr. Bartlett's collection consists of species already made known to 

 science by one or other of these authorities. Comparatively few of 

 them are new, and these are mainly species belonging to the more 

 obscure and difficult groups, which are likely to escape notice. Of 

 the 252 species collected by Mr. Bartlett we consider eleven only to 

 be certainly undescribed, namely : — 



1. Spermophila ocellata. 7. Muscisaxicola Jluviatilis. 



2. Furnarius torridus. 8. Serpophaya hypoleuca. 



3. Synallaxis terricolor. 9. Metopothrix aurantiacus. 



4. vulpecula. 10. Leucippus chlorocercus. 



5. Hypocnemis melanura. 11. Thaumantias bartletti. 



6. hemileuca. 



On these species and the rest of the collection we now proceed 

 to give our remarks, reserving our notes on the general aspects of 

 the ornithology of this interesting region until the arrival of further 

 collections from our energetic and enterprizing traveller shall enable 

 us to found them upon a wider basis. 



The nomenclature followed in the present paper is that of Sclater's 

 ' American Catalogue.' We have to record our thanks to Mr. Gould 

 for determining the Trochilidce, two of which prove to be new to 

 science. 



Order 1. PASSERES. 



Fam. Turdid.e. 



1. Turdus amaurochalintjs, Cab. Mus. Hein. p. 5. 



A single specimen of this Thrush agrees nearly with a typical exam- 

 ple of this species received from the Berlin Museum. Sclater's Turdus 

 iynobilis is very closely allied, but has the lores brown like the head. 



Hub. Lower Ucayalf. 



2. Turdus fumigatus, Licht. 

 Hah. Nauta. 



Fam. Sylviid^e. 



3. Polioptila buffoni, Sclater. 

 Hub. Upper Ucayali. 



The males have rather less white on the outer rectrices than the 

 type specimen, but still considerably more than the Brazilian P. leu- 

 cog astr a, Max. 



* I'. Z. S. 1858, p. 59. 



