Fig. 1 in Description of four new species of the Neotropical genus Scione Walker, 1850 (Diptera: Tabanidae)

Fig. 1. Head of Scione rufescens (Ricardo, 1900) in lateral view indicating the calculation of the clypeal index. Where 'a' is the measurement of the straight line drawn from the apex of the clypeus to the margin of the eye and 'b' is the measurement of the straight line drawn perpendicular to 'a' from the dorsal margin of the subcallus to the ventral margin of the gena. The clypeal index (C.I.) is obtained from the ratio of a/b.