They must have swarmed last night because the pool was covered with them this morning. I remember seeing what I think were Termites after a swarm up in Jocotepec but they were much smaller and didn't need to drown to die. The only good sized ants here are leaf cutter but these are larger .... so what are they? I did find the info below that says winged ants are usually larger than the worker ants so they could be leaf cutter.
After a nocturnal nuptial flight
Periodically, usually following by 3-5 days a heavy rain, the winged reproductive forms emerge from the colony in large swarms. Such swarming behavior is usually synchronized by other nearby colonies so large numbers of winged ants suddenly appear. All mating for the species takes place, often over the course of a single day. The males die and the mated females disperse to attempt establishing a new colony.
Alates (winged ants) are typically larger than the worker caste of wingless, sterile females, so are more noticeable for that reason as well.