Chasing butterflies and dragonflies

There was no bus services today because of the holiday (Victoria Day); plus, I figure it's probably time for me to start doing some exercises by biking to school today.  When I was getting close to the school, I saw a path leading to a field that I never paid attention to before.  Then I saw the field was busy with butterflies and dragonflies flying around.  Definitely a great detour.

This was the dragonfly that I saw today.  I took some photos of it, and I think it looks like a Frosted Whiteface, but any feedback is appreciated.

Frosted Whiteface (Leucorrhinia frigida) female