Body dark brown with yellow dashes on side of abdomen and thorax; leading edge of wings clouded with yellow brown?	Body gray-brown to pruinose blue with yellow dashes on side of abdomen and thorax; no clouded yellow-brown on leading edge of wings?
Four-spotted Skimmer Libellula quadrimaculata	Hoary Skimmer Libellula nodisticta

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