CORVIDAE 
a* Head with long crest of a few feathers# 
Calocitta formosa 
aa, Head not prominently crested* 
b* Plumage mainly brown 
Psilorhinus mexicanus 
bb* Plumage mainly blue* 
c* Back and crown blue. 
d* Larger, wing 165-168 mm., entirely blue 
except for black lores* 
dd. Smaller, wing 109-119# sides of head 
black, a narrow line of white along 
sides of crown. 
Cyanolyca pumile 
cc* Upper back, chest and much of head black* 
d* A crown patch of light blue 
Cyanolyca mltrata 
dd. Crown black 
Qissllopha melanocyanea 
