The document describes 4 species of the genus Polinices collected from northern Sulawesi, Indonesia:
1) P. (Mammilla) melanostoma, characterized by a whitish shell with diffuse brown zones and spots;
2) P. (M.) sebae, distinguished by a ear-shaped shell with well-defined brown spots and streaks;
3) P. (Polinices) flemingianus, identified by its globular shell with a closed umbilicus; and
4) P. (P.) tumidus, recognized by its ovate shell with an open umbilicus. The species are described and illustrated with measurements and keys provided