Membranaceous: thin, skin-like, semi-transparent, like parchment: of a thin, pliable texture.
Membrana retinens: the stretched part of the membrane around the rectum of butterfly larvae, used in the change to the chrysalis.
Membrane -ana: any thin, transparent, flexible body tissue: specifically the wing tissue between the veins: in Heteroptera, the thin membranous tip of the hemelytra.
Membranous or eous: composed of membrane or skin-like tissue.
Membranule: the small opaque expansion at base of wings in Odonata.
Meniscoidal: with one side concave the other convex, like a round segment from a hollow sphere.
Menognatha: insects in which both young and adults feed by mandibles; e.g. the Orthoptera: see menorhyncha and metagnatha.
Menorhyncha: forms in which both young and adult take food by suction e.g. Hemiptera: see metognatha and metagnatha.
Mental suture: in Coleoptera, the line between mentum and gula.
Mentigerous: bearing or having a mentum.