Males of Leptogenys (Lobopelta) borneensis Wheeler, 1919 are described, including their genital morphology, which is important for diagnostics and morphological phylogeny of the genus Leptogenys Roger, 1861. The mtDNA COI barcoding sequence of 607 bp obtained and uploaded to GenBank and BOLD. The species was previously known from Borneo (Malaysia: Sarawak — type locality), Thailand and Vietnam and is recorded for the first time from Sumatra (Indonesia)