I suppose it's somewhat odd to speak of a favorite insect, but my favorite is probably the firefly. In my mind, fireflies mean summer, no matter what time of year it is. And I love warm summer evenings, when I can be outside in shorts and a t-shirt in perfect comfort.
Here in East Tennessee we have a species of firefly called "photinus carolinus" that has the unique ability to synchronize flashes with others of the species. The only other species known to do this lives in Asia. It's evidently quite the spectacle, as you can read here: Fireflies in Unison. Hundreds of people gather each June in the meadows and clearings of the Smokies to watch the fireflies put on a show.
We've never gone to see the synchronized fireflies, but we have quite a few non-synchronized fireflies here on the farm. I love to walk through the gardens at night and watch them flash their lights. Last night we had rain approaching, so I watched the clouds roll in against the darkening sky as the first fireflies of the season began to glow among the trees. It was magical. I wish I could recreate it for you.
The lovely photo in this post comes from Firefly Crossings - a charity that provides vacation resort stays to familes with terminally ill children to allow them to relax together and create lasting memories. I think this is a wonderful idea and I hope this charity grows and expands, and then I further hope that one day there will be no more need for such things. I imagine the folks at Firefly Crossings would agree with me on that last bit!