Characteristic mating behavior patterns were evident in three IMP versus NON encounters. In two pairs the IMP female performed `thrusts' against the NON female, which is a typical male courtship pattern (Barki and Karplus, 1999). In the third encounter the mates exhibited the complete behavioral sequence of copulation twice, with the IMP female performing the male behavior pattern. The time durations of the main component of the copulation, namely `freezing'– a motionless male-beneath-female position with the ventral surfaces brought face to face – were 74.9 and 77.9 s in these two copulations, which is within the range found previously for normal males and females under similar conditions (112±81 s; Barki and Karplus, 1999), as were the time intervals from the first physical contact (`chela contact') to `freezing' (12.9 and 14.3 s, respectively).