( 387 ) 



colouration than to the structure of the bird, and we believe this to be contrary 

 to his usual practice. 



We consider that colour alone is of no generic value— as, for instance, in the 









^ 



Oi'ii.\pi:a ncbt in a cactus. 



Hawaiian genus Oreomijza, where the entire genus is composed of yellowish green 

 birds with tlie single p.\:cei)tion of (>reomi/za jfammea, which is flaming scarlet. At 

 the other e.\treme Mr. Ridgway separates off Geospiza crassirostn's Gould from 

 CamafhynchiM under PlaUjspiza, because it has the gonys slightly less arched nd 



