I lifted off the roof from the hive and saw at the same time how the dead drone on the roof slowly began to glide off it down into the grass. During a fraction of a second I saw that the drone had the mating organ depleted. It had mated, died and fallen down on the hive roof. That is, it had mated just above the hive or not far from it. The apiary was a drone congregation area. It had to be documented. I had the camera with me lying in the car.
But I realized when the drone fell down into the grass that it was too late. I would never find the drone and put it back on roof and photograph it. And I never did.
The apiary is situated in a little hollow, not a perfect place according to some as it would keep cool air in the winter. But the sun warmes the place and it has bushes and some trees that give shade during part of the day. Close to spring flowers, water supply and good summer flow. Upwinds are said to be a part of the forming of drone congregation areas, where virgin queens mate. It seems that the apiary happens to be a drone congregation area.
By the way there were two splits that had virgins ready for mating now.