Epitheca princeps (Prince Baskettail).
 
 
 
Size: approx. 70-80 mm. Photo: 04/09/17.


Not a very good photo but this large dragonfly was constantly flying over our little lake about 10-30' away from my dock. It was also pretty fast and fun too watch. 
 
 
Giff Beaton:
http://www.giffbeaton.com/emeralds.htm