The Subspecies of lucanid beetle Cyclommatus metallifer (Boisduval, 1835) from Indonesia are revised here. Six subspecies were known from Indonesia. Among them, Cyclommatus metallifer otanii Mizunuma and Nagai, 1991 was confirmed to be a synonym of Cyclommatus metallifer aenomicans Parry, 1863. Moreover, a new subspecies, Cyclommatus metallifer butonensis ssp. nov., is described from Buton Island of Indonesia. The identification key, distributional data, photos of adult habitus, male genitalia, and figures for each species are provided.
In this research, taxonomic revision conducted on subspecies of Cyclommatus metallifer (Boisduval, 1835) which are endemic to Indonesia, and totally 6 subspecies were recorded. Among them, Cyclommatus metallifer otanii Mizunuma et Nagai synonymized by Cyclommatus metallifer aenomicans Parry. And also Cyclommatus metallifer ssp. nov. is recorded. total 6 subspecies will be confirmed as valid subspecies