Key to Mediterranean species of Phacophallus Coiffait, 1956

Note. The species of Phacophallus are very similar in their external characters. Since the aedeagus is reduced to a subspherical basal bulbus and lacks parameres, species identification is based on characters of the internal sac.

1. Internal sac coiled ribbon-like or tubiform, very long and narrow, with scales and/or spines.................... 2

- Internal sac large, short and flat, covered by minute scales. Tunisia .................................. P . tuniseus n. sp.

2. Internal sac totally covered by very dense scales, without spines. France, Sicily......................................... ............................................................................................................ P. pallidipennis (Motschulsky, 1858)

- Internal sac covered by sparse scales, with a proximal large spine and a median series of short and large scales. Mediterranean ......................................................................... P. parumpunctatus (Gyllenhal, 1827)