38 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4TH SER. 
pagos and Hawaiian archipelagoes apparently exemplifies 
geographic variation in both color and size. As of other vari- 
ations in the Tubinares, our knowledge of geographic vari- 
ation is far from being complete, and all the facts respecting 
its extent will not be known until series of specimens from all 
the breeding stations of each species have been thoroughly 
studied. 
Recent systematists appear to be unaware of the wide range 
of variation existing in the species of the Tubinares and have 
considerably augmented the synonymy of the group by mistak- 
ing unstable for stable characters. 
