Abstract
Territorial behaviour of male X. hirsutissima was studied. Depending on wind direction the male establishes a territory on or near the mountain top where he hovers behind or in a little shrub, protected from the wind and facing away from the shrub. With the aid of the legs, the mandibular gland secretion appears to be distributed over the ventral side of the abdomen. This secretion serves as a sex pheromone. Small insects approaching the male evoke pre-copulatory behaviour. Females fly upwind towards the male and appear to land on the shrub, immediately behind the males hovering place. Mating occurs or is initiated at this site. The mating biology of X. hirsutissima is compared with that of some other species within the genus and a basic similarity is noted.
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