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Show 1866.] ON BIRDS COLLECTED ON THE RIVER UCAYALI. 175 Section 4. Alar hyalinar, maculis ovatis nigris vuriar. 64. Danais gaura. 65. Danais daos. M y 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 therefore 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 River Ucayali, Eastern Peru, with Notes and Descriptions of N e w Species. By P. L. S C L A T E R , M.A., Ph.D., F.R.S., and O S B E R T SALVIN, 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 expedition of Mr. Edward Bartlett, son of the Superintendent of the Society's Gardens, to the Peruvian Amazon. Mr. E. Bartlett left Liverpool on the 17th of January 1865, in a small schooner, and arrived at Para towards the close of the following 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 returning 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 |