Is there a clear spot in the mark at the base of the front wing, and the chalky blue color on the abdomen extends up to the outer dark band of the wing?	Is there a yellow dash on the side of the thorax and is the mark at the base of the wing solid black?
Desert Whitetail Libellula subornata	Common Whitetail Libellula lydia

Written by Mark Lung and Stefan Sommer, 2000
Photos by Dennis Paulson, 2001.