Damselfly

My college roommate and I get together at least three times a year - for our birthdays and Christmas.  We live only 40 minutes from each other, but it's enough to let our busy lives get in the way of more frequent visits.  Today we celebrated her summer birthday with a walk on the canal followed by n outdoor lunch.  We ignored the fact that the heat index today was over 100 degrees F.  After, I couldn't resist going back to the canal with my camera.  I think my best shot today was this damselfly.  I'm trying to look up the insects, birds and bees to learn more about their identify, but this one has me a bit puzzled.  I think it's a Common Blue, but the pictures I see have a blue tail, not black and blue.  Oh well, it's close enough.