NO. 1116. 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



463 



uearest relatives, apparently, are tlie Galapagos genus Geospiza (sub- 

 genus '■'■Cactornis'''') and subgenus ErihaUs of the continental genus 

 Myiarclius. If, therefore, the Galapagos group and Cocos Island, together 

 with a connecting land area, were formerly united to the continent, the 

 relationships of their bird fauna i)oint to a Central American rather than 

 a South American connection ; but in order to account for this relation- 

 ship actual land connection with the continent is not necessary, the 

 narrow passage of deep M^ater (between 1,600 and 1,700 fathoms) which 

 ])ossibly may always have intervened being easily crossed by birds of 

 only ordinary powers of flight. 



Forty- six genera of birds have thus far been found in the Galapagos 

 Archipelago. Following is a list of them, together with an exposition 

 of their geographic range: 



List of genera of Galapagos birds. 



Geographic range. 



