2.5−2.9 mm long (mean = 2.64 mm; n = 5); 2.78−3.0 times as long as wide. This species is distinguished by the distinctive elytral mycangium appearing as a distinctly impressed area immediately adjacent to the scutellum on each elytron, margins flush with elytral suface; and elytraldeclivity steeply sloping, occupying apical quarter of elytra.
The gallery system is unusual in lying between the bark and wood and not penetrating the wood. The parent female, larvae, and pupae are all found together in communal chambers under the bark (Murayama 1955, Nakashima et al. 1992).