I've never seen a carpenter ant hatch, but I'd sure like to.

The most epic ant hatch I've ever seen was in May on Coldwater lake.
The lake looked like popcorn popping all day, fish rising everywhere and ants crawling all over our boats.

I've also seen searun cutts in the salt below my house go crazy for flying termites in the fall.

You've got me thinking. I may have to tie up some solid black chernobyl ants. Even without a hatch, trout have a hard time passing up an easy ant meal...same with beetles as well.