At the roosting sites 26 tandem formations of males with individuals of 7 other Anisoptera spp. were observed in the morning. Males are active before sunrise and fly low in the vegetation searching for females. They approach other dragonflies which perch motionless at the roosting sites and show no refusal displays. Males grasp them and form tandems, but there were no heterospecific copulations. With increasing morning temperature the other Anisoptera spp. became active and the tandems separated. Towards the end of the breeding season of S. depressiusculum the proportion of the other spp, of Anisoptera in the roosting community and the number of helerospecific tandem formations increased.