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We revise the Oriental species of Bruchomyiinae based on type and additional material, with first descriptions of the genus Alexanderia Wagner & Kvifte, gen. nov. and A. thailandensis Wagner, Rulik & Polseela, sp.nov. The genus further comprises Nemapalpus orientalis (type species), Nemopalpus vietnamensis and Nemapalpus unicolor . Alexanderia thailandensis is described using morphology of males and females and DNA barcodes, whereas A. orientalis comb.nov., A. unicolor comb.nov., and A. vietnamensis comb. nov. are redescribed. The male and female internal genitalia in the genus are discussed in the context of sexual selection, and we suggest that the spermathecal ducts of the female and the basiphallic musculature of the male may be shaped by a male/female coevolutionary arms race.