OF THE GALAPAGOS ARCHIPELAGO. 465 
Of these 57 species 19 only have as yet been found outside the limits of the archi- 
pelago, leaving 38 species peculiar to the islands, or more than 66 per cent. 
Putting aside 21 of the 57 species, being the sea- or shore-birds, we have a remainder 
of 36 land-birds; of these 36 species only four, with our present knowledge, can be 
said to inhabit exclusively one island. These are Mimus parvulus of Albemarle Island, 
Geospiza dubia of Chatham Island, Cactornis abingdoni of Abingdon Island, and Cac- 
tornis pallida of Indefatigable Island. Very little can be said to be known of any of 
these four species; so that it is quite probable that they too may occur in other islands. 
It will be seen, then, that Mr. Darwin’s remarks on the internal distribution of the birds 
of the archipelago require modification, and that certain species have not the exceed- 
ingly restricted range that he supposed. 
With regard to the 19 widely ranging species, we see that 9 of them are solely 
American, the remainder being American also but at the same time more extensively 
distributed. 
Distribution of the Genera of Birds found in the Galapagos. 
1. Mimus . . . North and S. America. 21. Phenicopterus . Tropicopolitan. 
2. Dendreca . . North and Central Ame- 22. Querquedula . Cosmopolitan. 
rica and West Indies. 23. Dafila. . . . Cosmopolitan. 
3. Progne . . . North and S. America. 24. Zenaida . . . South America. 
4. Certhidea . . Galapagos. 25. Porzana. . . Cosmopolitan, 
5. Geospiza. . . Galapagos. 26. Aigialitis . . Cosmopolitan. 
6. Cactornis . . Galapagos. 27. Hematopus . . Cosmopolitan. 
7. Camarhynchus . Galapagos. 28. Himantopus. . Cosmopolitan. 
8. Dolichonyx . . North America. 29. Strepsilas . . Cosmopolitan. 
9. Pyrocephalus . South America. 30. Calidris . . . Cosmopolitan. 
10. Myiarchus . . North and S. America. 31. Heterosceles. . Shores of North and South 
ll. Asio . . . . Cosmopolitan. Pacifie Ocean. 
12. Strix. . . . Cosmopolitan. 32. Tringa . . . Cosmopolitan. 
13. Buteo. . . . Cosmopolitan. 33. Numenius . . Cosmopolitan. 
14, Pelecanus . . Cosmopolitan. | 384. Anous . . . Tropicopolitan. 
15. Sula . . . . Cosmopolitan. 35. Larus. . . . Cosmopolitan. 
16. Fregata . . . Tropicopolitan. 36. Creayrus. . . Galapagos?. 
17. Phaeton . . . Tropicopolitan. 37. Gstrelata . . Cosmopolitan. 
18. Ardea . . . Cosmopolitan. 38. Procellaria . . Cosmopolitan. 
19. Butorides . . Tropicopolitan. 39. Spheniscus . . Antarctic Seas. 
20. Nycticorae . . Cosmopolitan. 
It will be seen from this table that 27 out of the 39 genera of birds represented in 
the Galapagos Islands are of very wide distribution. Of the remaining 12, 7 are found 
in continental America, leaving 5 peculiar to the islands. It is the presence of these 
7 genera therefore that demonstrate, beyond all doubt, the zoological affinity of these 
islands to the American continent, so far as the class Aves is concerned. 
1 Perhaps also California. 
3R2 
