Female. Similar in size and in habitus to M. albopunctata, Goeze (=grisea, F.). Head small, ponotum covering it almost to the eyes. Fastigio-frontal suture scarcely longer than the width of the first antennal joint. Pronotum relatively shorter and broader than in M. albopunctata; its base scarcely narrowed anteriorly, practically flat and smooth in prozona, very slightly impressed and distinctly punctured in metazona; hind margin very broadly rounded; lateral keels very much rounded; median keel distinct in metazona, faintly indicated in prozona; lateral lobes less high than in M. albopunctata, with the anterior margin more oblique. Prosternum unarmed. Mesosternal lobes much longer than at the base, broad, their apical angles about 30. Meta-sternal lobes not longer than broad, their apical angles straight. Elytra extending well beyond the hind knees. Hind femora relatively shorter than in M. albopunctata and more suddenly attenuate behind the middle, coarsely punctured above. Last sternites without any peculiar structures. Subgenital plate unusually narrow and long, covering the basal fourth of ovipositor; its lower surface finely keeled along the middle, slightly impressed sideways; apex narrow, deeply and very acutely excised; apical lobes lying very closely to sides of ovipositor, with the inner margins rounded, the outer margins straight, and the apical angles slightly less than 90. Ovipositor like that of M. albopunctata, but more strongly narrowed in the apical half.