COMPARATIVE STUDIES ON THE MALE GENITALIA OF EIGHT MELANOSTOMINI SPECIES (DIPTERA,SYRPHIDAE,SYRPHINAE)

Comparative study on the male external genitalia of eight species in three genera of Melanostomini, Melanostoma orientale, M. mellinum, M. scalare, M. tiantaiensis, Platycheirus albimanus, P. bidentatus, P. scutatus, Xanthandrus comtus(Diptera, Syrphidae, Syrphinae), are male. The results show that structures of the male external genitalia of different species in the same genus are similar, but there are still a few among differences in the colour of the genitalia and the shap of aedeagus base. The structures of the male external genitalia are variable distinctly to different genera, especially the shap of the styles and superior lobe.