Proceedings of the Scientific Meetings of the Zoological Society of London 1867

Page 647

594 MESSRS. SCLATER AND SALVIN ON [May 23, Accipitres, Grallee, & c , which are mainly birds of wide distribution, many of them extending over the whole neotropical region. Having deducted these 96 we have left a residuum of 144 of more local character as regards their range, an examination of which will at once solve the question to which of the great zoological divisions of South America the district of the Lower Amazons pertains. Of these 144 species not less than 88 (or 61 per cent.) are identical with species found in "Cayenne, either belonging to forms peculiar to the Guianan province, or, if occupants of a more extended area, ranging westward and north-westward into the Upper Amazons or Venezuela, New Granada, and Central America, but not extend­ing southward into the wood-region of South-eastern Brazil. Not only is this Guianan element noticeable for its numerical extent in species, but also as exhibiting such well-marked forms as Pithys, Phcenicocercus, Heematoderus, Querula, Urogalba, Jacamerops, Opis­thocomus, and Psophia, all of which are quite foreign to the wood-region of South-eastern Brazil. The Guianan facies of the Para district is further shown by an examination of the instances in which the two provinces of Guiana and South-eastern Brazil are occupied by corresponding representative forms. In almost every case the Para form, when ascertained, is found to belong to the Guianan and not to the Brazilian species. In the subjoined table, of fourteen instances of this sort, it will be noted that there is only one positive exception to this rule. In two other cases both Guianan and Bra­zilian species occur within the Para district, and the River Amazons appears to form the boundary between them, the Guianan species being; found on the north bank and the Brazilian on th? south*. CAYENNE. 1. G. aequinoctialis. 2. C. guianensis .. T. episcopus P. viridis E. macrurus 3. 4. 5. 6. I. cayanensis 7. C. anthoides 8. F. pica 9. E. olivus 10. G. viridis 11. C. tenebrosa . 12. P. aracari 13. R. vitellines . 14. C. flavigularis PARA DISTRICT. Geothlypis aequinoctialis Cyclorhis guianensis Tanagra episcopus Pitylus viridis Emberizoides macrurus, var.. Tcterus cayanensis *.': Corythopis anthoides '...'• Fluvicola albiventris Empidochanes olivus f Galbula viridis \ rufo- viridis Chelidoptera tenebrosa Pteroglossus aracari Bamphastos ariel vitcllinus Chloronerpes flavigularis. BRAZIL. G. velata. C. ochrocephala T. cyanoptera. P. brasiliensis. E. sphenurus. I. tibialis. C. calcarata. F. albiventris. E. fuscatus. G. rufo-viridis. C. brasiliensis. P. wiedi. R. ariel. C. erythropis. * The River Amazon probably divides the range of the following species:- Pipra flavicollis from P. aureola. , . Xipholena lamellipennis from X. pompadora. Galbula rufo-viridis from G. viridis. Urogalba amazonum from U. paradisea. Bucco hyperrhynchvs from B. macrorhynchus. Thalurania furcatoides from T. fareata. Campylopterus obscurus from C. laryipennis. Ramphastos vifellinus from E. ariel. Psophia obscura from P. crepitans.