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Bothe species, socius and cyanurus show a high variety in most characters. SPEIGHT found only one possibilty for separation: the microtrichia on wings. If you haven't the specimen in your collection for checking, please use Neoitamus spec.. Yours

Speight, M.C.D. (1988): Neoitamus cothurnatus (Diptera: Asilidae) not an Irish species. - Irish naturalists' journal 22(11): 485-487; Belfast.