I860.] ON BIRDS COLLECTED ON THE RIVEK UCAYALI. 1 7 i> 



Section 4. 

 Ala hyulinee, maculis ovatis nigris varice. 



64. Danais gaura. 65. Danais daos. 



My species are marked with an asterisk. 



The great similarity of pattern and coloration that exists in this 

 genus renders the determination of the species, without the aid of 

 figures, next to impossible, especially as some of the species (?) are 

 founded upon the absence or presence of a single spot ; I may there- 

 fore have unwittingly redescribed some of the recently acquired forms 

 from absolute inability to make them agree with the descriptions 

 given. 



5. Catalogue of Birds collected by Mr. E. Bartlett on the 

 lliver Ucayali, Eastern Pern, with Notes and Descrip- 

 tions of New Species. By P. L. Sclater, M.A., Ph.D., 



F.R.S., and Osbert Salyin, M.A., F.Z.S., &c. 



* 

 (Plate XVIII.) 



The collection of birds which we have the pleasure of bringing 

 before the Society this evening is part of the firstfruits of the expe- 

 dition of Mr. Edward Bartlett, son of the Superintendent of the So- 

 ciety's Gardens, to the Peruvian Amazon. 



Mr. E. Bartlett left Liverpool on the 1 7th of January 1865, in a 

 small schooner, and arrived at Para towards the close of the follow- 

 ing month. Thence he proceeded by the line of steamers which now 

 navigate the Amazons to Nauta, in Eastern Peru, situated on the left 

 bank of the main stream a little above the junction with it of its 

 large southern tributary the Ucayali. Mr. Bartlett did not reach 

 Nauta until the first week in April, having been somewhat delayed 

 by changing steamers at Barra, Tabatinga, and Yquitos. After about 

 a month's stay at this place he started on a five months' excursion 

 up the Ucayali in boats, leaving Nauta early in May, and not return- 

 ing there until the end of September or beginning of October. The 

 highest point attained during this excursion was Cashaboya, three 

 days' journey above Sarayacu. At these two localities and along the 

 banks of the Ucayali, between its confluence with the Amazons and 

 Cashaboya, the greater part of the present collection of birds was 

 formed, some few only being from Nauta, and perhaps one or two, to 

 which no locality is attached, from other places on the main stream. 

 The total number of the skins contained in the present collection is 

 about 700, representing 252 species. But before we say more about 

 them it may be proper to state shortly what has previously been done 

 towards working out the ornithology of the country traversed by 

 Mr. Bartlett. 



The only work that professes to give any connected account of the 

 ornithology of the Peruvian republic generally is Tschudi's ' Fauna 



