Eulepto car abus portecticollis is endemic to Japan and is sporadically distributed solely in Honshu, from the Tohoku District (eastern Honshu) to the Chugoku District (western Honshu)(Fig. 7.1). The distribution pattern suggests that this species is well isolated geographically in various places, and yet only two subspecies have been identified, based on minor morphological differences. The two subspecies are E. p. kansaiensis, found in the Kinki District of western Honshu, and the nominotypical subspecies found throughout other areas (Nakane 1961).