1907. WALTER ROTHSCHILD. On Extinct and Vanishing Birds. A short Essay on the Birds which have presumably become extinct within the last 500 years, and also of those birds which are on the verge of extinction, including a few which, though not yet so far gone, are threatened with extinction in the near future. In Proceed, of the IV Intern. Ornith. Congress, London 1905, pp. 191-217. * * * * * {xxvii} LIST OF PLATES. 1. _Fregilupus varius_. From the plate in the "Volume Centenaire," Mus. Hist. Naturelle, Paris. 2. 1. _Foudia bruante_. From the figure in Daubenton's work. 2. _Necropsar rodericanus_. Made up from description. 3. _Necropsar leguati_. From the type specimen in Liverpool. 3. 1. _Geospiza magnirostris_. From the type specimen in London. 2. _Geospiza strenua_. Head. From specimen at Tring. 3. _Nesoenas mayeri_. From specimen in the British Museum. 4. _Chaunoproctus ferreorostris_ [male] [female]. From the pair in the British Museum. 4. 1. _Hemignathus ellisianus_. After a drawing from the type in the Berlin Museum. 2. _Heterorhynchus lucidus_. From a specimen in the Paris Museum. 3. _Psittirostra psittacea deppei_. From the type in the Tring Museum. 4. _Ciridops anna_. From a specimen in the Tring Museum. 4A. 1. _Moho apicalis_. From specimen in the Tring Museum. 2. _Chaetoptila angustipluma_. From specimen in the Tring Museum. 5. 1. _Miro traversi_. From skin in the Tring Museum. 2. _Traversia lyalli_ [male] and [female]. From the type specimens in the Tring Museum. 3. _Bowdleria rufescens_. From a skin in the Tring Museum. 5A. _Siphonorhis americanus_. From skin in the British Museum. 6. 1. _Nestor norfolcensis_. From the plate in the Bulletin of the Liverpool Museum. 2. Head of _Nestor productus_. From a specimen in the Tring Museum. 7. _Lophopsittacus mauritianus_. From ancient drawing and description. 8. _Necropsittacus borbonicus_. From a description. 9. _Mascarinus mascarinus_. From the drawing in the Volume commémoratif, Centenaire Mus. Paris. 10. _Ara tricolor_. From specimen in the Liverpool Museum. {xxviii} 11. _Ara gossei_. From Gosse's description. 12. _Ara erythrocephala_. From Gosse's description. 13. _Anadorhynchus purpurascens_. From description. 14. _Ara martinicus_. From description. 15. _Ara erythrura_. From description. 16. _Conurus labati_. From description. 17. _Amazona violaceus_. From description. 18. _Amazona martinicana_. From description. 19. _Palaeornis exsul_. From the plate in the "Ibis." 20. _Palaeornis wardi_. From the plate in the "Ibis." 21. _Hemiphaga spadicea_. From the specimen in the Tring Museum.