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Abstract

Drosophila biarmipes males possess an apical black patch on their wings. In a laboratory stock of this species, males without such a patch have been found. Mating success of these two types of male was studied in an Elcns-Wattiaux mating chamber. Results show that males possessing the dark black patch have greater mating success than those without. This finding suggests that visual stimulus plays an important role in the mating behaviour of D. biarmipes.