Merodon melanocerus Bezzi 1915

Diagnosis of the melanocerus species group The main diagnostic character of the Merodon melanocerus species group is the presence of a patch of dense and strong yellow pile on the metatrochanter (Fig. 3A: marked with arrow). The melanocerus species subgroup has the oral margin notched, produced forward, and bare (Fig. 3B: marked with arrow), while the planifacies species subgroup has the oral margin reduced and microtrichose.