Fragile Forktails (Ischnura posita) are not really worthy of an exclamation point, except that this punctuation mark appears on the thorax. Usually the markings are pale green, but females and immature males are blue, like this one I saw a couple weeks ago:
Stylurus and I went to a new wetland area adjacent to one of the local rivers. Considering the very hot weather we had a couple weeks ago, we sort of expected some Aeshnas to be out and about, but we saw none. Our most notable find was a single female American Rubyspot (Hetaerina americana) along the river. This is a particularly flashy, silty, pretty polluted river, and we've never seen a rubyspot along any of its branches or tributaries. The next day I read that a 500,000 square-foot shopping center will be built nearby. There goes the neighborhood.