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(A) Eumerus hungaricus (only the basis of the spiracular setae are left in this specimen). (B) Eumerus nudus. (C) Eumerus strigatus. (D) Merodon geniculatus. Abbreviations: c, spiracular scar; o, spiracular openings; s, spiracular seta. Views: apical (A, B and C), apico-ventral (D). Scale lines: A = 0.1mm; B and C = 0.2mm; D = 0.25mm.
