By Richard L. Barclay (Notroll) on Sunday, May 9, 2010 - 05:33 pm:
From the following site I copied and edited for reading this paragraph.
Winged carpenter ants will emerge in May. Known as alates, these winged ants are both males and females that have developed during the previous year and over-wintered deep inside the nest. When day length, temperature, and humidity send the right clues, all the alates gather at the nest entrance, "sunning" in the spring light and twisting their abdomens in an excited dance. They take off on their nuptial flight in dense clouds that can be mistaken for smoke wafting off treetops and provide food for any number of insect-hawking birds. In the air, the males copulate with the females, who store the sperm in internal pockets. While the males soon die, surviving females spiral down to the ground to make their attempt at becoming full-fledged queens.
http://www.northcolumbiamonthly.com/boundaries/boundaries0507.shtml