528 



BIRDS OF THE GALAPAGOS ARCHIPELAGO— BIDG WAY. vol.xix. 



between the two supimsed .si)eeies can not be sharply drawn. There is 

 also a young- male from Chatham Island (Xo. 115950, U.S.X.M.), which 

 is so much larger than other specimens that I am inclined to consider 

 it a hybrid between G . fuUglnosa and G. ilithia. 



The following measurements of a large series of G. fuliginosa 

 are given not only to show the extent to which specimens from the 

 several islands differ, but also for comparison with G. pco'vvla, the 

 smallest billed specimens having been selected whenever a particular 

 island was represented by a considerable series. Unfortunately the 

 different islands are represented so unequally that a larger number of 

 specimens could not be selected without impairing the value of the 

 comparison: 



ileasuremottii of Cieoapi^a fuliginosa. 



