226 I The Process of Evolution 



olive-buflF (James Island) and wash-brown (Culpepper, Wenman, 

 Charles Islands ) to white ( Barrington Island ) . 



The peripherally distributed G. conirostris is, except for size, quite 

 similar to the central G. scandens, the two forms being completely 

 allopatric. Three ground finches (G. magnirostris, G. fortis, and 

 G. fuliginosa ) are widely sympatric and differ superficially in overall 

 size and relative beak size. Where the three forms occur together 



Fig. 1 0.6 I Map of Galapagos Archipelago showing main islands. Numbers 

 give the total of different kinds of Geospizine finches recorded from each 

 island. {After Bowman, 1961, University of California Publications in 

 Zoology 58. ) 



92° 



91° 



90° 



