Single yellow spot on top of abdomen?	Red patch where thorax meets abdomen?	Red broken line on top of abdomen?
Dot-tailed Whiteface Leucorrhinia intacta	Red-waisted Whiteface Leucorrhinia proxima	Hudsonian Whiteface Leucorrhinia hudsonian

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