the
longest period of observation. All females used in our experiments
performed their first ovipositions later than day 13 (=last day of
behavioural observation) after imaginal moult. Analysis of videotaped
behaviours included (1) numbers ofmalemating attempts, (2)
number and duration of mountings of females by males and (3)
stridulatory activity of the females. Male mating attempts were
counted as such if themale tried tomount the female after producing
one or several sequences of courtship song in the vicinity of the
female(Faber,1929).Onefemalediedduringtheexperimentandwas
replaced by a younger one. Outside daily observation times, males
and females were kept in separate rooms.