Volume 9, Issue 3
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Mating experiments with several strains of and at different temperatures showed that was more active at all temperatures, but was less inhibited than at the highest temperature. With decreasing intensity of illumination, began swarming sooner than did , but ceased shortly after complete darkness was attained, whereas continued to swarm in the dark.

It is concluded that does not exhibit a specific temperature adaptation for mating, but that the higher insemination rates at all temperatures were the result of an inherent sexual aggressiveness. However, such differential activity could be a means of limiting the establishment of in warmer areas, where it would have to compete with the more active . Furthermore, these differences in response to temperature and changes in illumination could be a mechanism for keeping the populations segregated in some areas where they coexist.


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