In the rainforests of Victoria, Australia,D. (Scaptodrosophila)inornatais the common species. Within these habitats distributions may depend on temperature/humidity relationships. There appears to be one boundary condition at 12°C below whIch flies are inactive and rarely found, and another in the 20–30°C range dependent upon temperature/humidity interactions. Between these extremes flies are collected from tree fern fronds at varying distances from permanent water. These results suggest there may be behavioral responses to the physical environment.