PLATE 41 
From Handbook of Birds of the Western United States 
Arkansas and Cassin Kingbirds 
The ash-gray, yellow-bellied Arkansas hovering over the darker Cas¬ 
sin, both loudly disputing the issue. As they hold themselves 
in midair, they display their diagnostic wing and tail marks—the 
pattern of the cut wing quills (differing again in the eastern 
Kingbird) and the different contrasting black and white of the tail 
