Fig. 3 in A revision of the Philoliche aethiopica species complex (Diptera: Tabanidae)

Fig. 3. Frons divergence in females of (a) P. rondani and (b) P. aethiopica. The index of frons divergence is the ratio of the width of the frons at the clypeal suture (cs) to the width of the frons at the vertex (v). Note also that most P. aethiopica also have an obtuse angle in the inner eye margin (ea), though this is variable.