94 



Oberholscr Description of a New Querquedula. 



with no other species, and bears much the same relation to Q. cyanoptera 

 that Querquedula puna does to Q. versicolor. Strangely enough, Querque 

 dula cyanoptera, despite the vastness of its range, from British Columbia 

 to the Falkland Islands, seems to be indivisible into races, since there is 

 no difference that we can discover in either size or color between birds 

 from the United States and those from Chile or the Argentine Republic. 



The great contrast in size that characterizes this new species is evident 

 from the following millimeter measurements of adult males: 



Querquedula orinomus. 



Querquedula cyanoptera. 



