Note on <i>Lucanus</i> Scopoli 1763 species from Southeast Asia with the description of a new species (Coleoptera: Lucanidae)

Lucanus collardi n.sp. from Vietnam and Laos is described. It belongs to the large L. fortunei Saunders 1854 species group and is closely related to L. adelmae Zilioli 2003. Lucanus collardi n.sp. can be easily distinguished at a glance from L. adelmae through the longer and differently denticulated mandibles, the pronounced posterolateral corners of the cephalic lobes, and the aedeagus, with longer flagellum, less widened apex and feebly curved parameres. The female of Lucanus satoi Nagai & Tsukamoto 2003 is also described for the first time, and the genitalia of that species are illustrated.