Genus Tabanus Linnaeus Key to species

1. Frontal callus with a spindle shaped linear extension...........................................2

– Frontal callus with the linear extension not spindle shaped................................... ……………………………………………………………………........... rubidus Wiedemann, 1821

2. Abdomen with median stripe continuous up to 6th segment, except on 2nd tergite absent; costal cell clear............................................ striatus Fabricius, 1787

– Abdomen with median stripe complete, present on 2nd tergite; costal cell not clear............................................................................................................................3

3. Abdomen with median stripe light and complete, present on 2nd tergite, lateral stripes much straight, costal cell tinge yellowish..................... tenens Walker, 1850

– Abdomen with median stripe complete, broad on 2nd tergite, lateral stripes in form of irregular spots appearing as steps, costal cell light yellowish........................ ……………………………………………………………................... dorsiger Wiedemann, 1821