 The mode of evolution of sex pheromones in "Bactrocera" has occurred by rapid saltational changes associated with speciation followed by gradual divergence thereafter.Saltational speciation has been recognized in the genus "Clarkia" (Lewis, 1966).It has been suggested (Carr, 1980, 2000) that the "Calycadenia pauciflora" could have originated directly from an ancestral race through a single saltational event involving multiple chromosome breaks.