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1.         Abdominal segments 1 to 7 with a dorsal median pubescent projection posteriorly from anterior             ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tabanus atratus

            Abdominal segments laking such projection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.         Anterior abdomiinal annuli broad, a transverse non-pubescent area dorsally in aeahc one; a             distinct posterior annulus on most of the abdominal segments, especially the seventh. . . . . . . . .             . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tabanus reinwardtii

            Anterior abdominal annuli narrow and without a transverse area on dorsal side; posterior annuli             very narrow and irregular. . . . . . . . . . . . . . . . . . . . . Tabanus fairchildi (synonymy T. vivax)

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