CHAr. XIII.] 



THE GALAPAGOS ISLANDS. 



271 



FllINGILLID^. 



8. 



9. 

 10. 

 11. 

 12. 

 13. 

 14. 

 15. 

 16. 

 17. 

 18. 

 19. 

 20. 

 21. 

 22. 

 23. 

 24. 



Geospiza mfigriirostris 

 „ strenua 



J, dubia 



fortis 



iiebulosa ... 

 fuliginosa... 

 „ parvuLa 



dentirostris 

 Cactornis scanderis ... 



assimilis ... 

 abing-doiii 

 pallida 



Cam arl: 



A distinct genus, but allied to the 

 South American genus Guiraca. 



...J 



..."1 



r A genus allied to the last. 



ynchus psittaculus 

 , crassirostris ...I A very peculiar genus allied to Neo- 



, variegatus ... }■ rhynchus of the west coast of 



prosthemelas... j Peru. 



habeli 



J 



25, Dolichonyx oryzivorus 



ICTERID.^. 



... Eanges from Canada to Paraguay. 



26. 



27. 



Pyrocephalus nanus... 

 Myiarchus magnirostris . 



TYRANNIDiE. 



... Allied to p. nilmuAis of Ecuador. 

 ... Allied to West Indian species. 



28. Zenaida galapagensis 



( A peculiar species of a S. American 

 ■ \ genus. 



29 Buteo galapagensis., 



Falcontd^e. 

 ... A buzzard of peculiar coloration. 



30. 

 31. 



Asio galapagensis ... 

 Strix punctatissima ... 



Strigid^. 



f Hardly distinct from the wide-spread 

 "■ \ A. hrachyotus. 



. . . Allied to tS.fiammea but quite distinct. 



We have here every gradation of difference from perfect 

 identity with the continental species to genera so distinct that 

 it is difficult to determine with what forms they are most nearly 

 allied ; and it is interesting to note that this diversity bears a 

 distinct relation to the probabilities of, and facilities for, migra- 

 tion to the islands. The excessively abundant rice-bird, which 

 breeds in Canada and swarms over the whole United States, 

 migrating to the West Indies and Soutli America^ visiting the 



