Tabanus cordiger also known as the plain-eyed grey horsefly is a species of biting horse-fly. Description Diagnostic characters include: Abdomen: dorsal side with a lateral line of light spots placed between the midline and the lateral edge of the tergites, so that on the black background you can see five light longitudinal lines: one median, two lateral, and two marginal, separated from each other by four black lines . Antennae: third segment with a blunt or short tooth. Wing: hyaline costal cell. Eyes without colour bands. Male: back of the eye area widely exposed, especially near the ocellar tubercle, bristling with a fringe of long hairs. Palps: second segment swollen. Female: back of the eye area slightly wider; back of the eye area slightly wider; space between the eyes 3.5 times longer than wide in front; middle plate bare, isolated. -- Length 12-17 mm. Seguy, E. 1927 Faune de France 13: Diptères (Brachycères) (Stratiomyiidæ, Erianidæ, Cænomyiidæ, Rhagionidæ, Tabanidæ, Codidæ, Nemestrinidæ, Mydaidæ, Romoyiidæ, Therevidæ, Omphralidæ) Lechevalier editions (Paris: Éditions Faune de France)
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