Yeah, sorry gteencelot...
As LIA said..
They are known as the Formosan subterranean termite - or 'super-termite' - a single colony can contain millions and consume 400g of wood a day
They get some mass hatching signal and billions take flight just after dark - generally once or twice a year around this time - actually earlier, usually, and it may have already happened.
They are attracted to light so kill all lights and meditate for 45 minutes or so if that's practical. It's all over by then and you can turn the lights back on
The flying stage is short lived and they drop their wings and go off to burrow into some wood and mate and lay eggs and get ready for next year
They have invaded parts of the US but not Colorado, so far as i know
LIA, I wonder if the subdued hatching was due to it having been a relatively dry year up north - it was wet here and we had a bumper crop