VITELLOGENESIS IN AUSTRACRIS-GUTTULOSA (WALKER) (ORTHOPTERA, ACRIDIDAE) IN TROPICAL AUSTRALIA

In tropical northern Australia, vitellogenesis in Austracris guttulosa only occurs if two requirements are met: daylength exceeds 13 h and v egetation is green. During the dry season (April-September), daylength is short and vitellogenesis is inhibited regardless of vegetation con dition. Daylength exeeds 13 h by mid October, and vitellogenesis begin s by late October if there is green vegetation produced by recent rain . But it is often dry during October and vitellogenesis is delayed unt il it rains either in November or even December.