A swarm of Hemianax ephippiger was observed in Eilath (Israel) on 12 March 1986. During the week before this date, no dragonflies were to be seen. In the late afternoon thousands of dragonflies were observed at the beach, 8 km SW of Eilath. They were resting on walls of buildings or flying slowly around. They did not fly in any common direction. l estimated the number of individuals along a 2 km beach to at least 25,000 specimens. Next day the swarm had disappeared and only scattered specimens were left. The remaining individuals, however, were very active and alert and did not exhibit the slow and drowsy flight observed on the day be- fore.
Entomologisk Tidskrift, 1988, Vol 109, Issue 1, p. 46-47