Metopidium: the anterior declivous surface of prothorax in Membracidae. Micans: shining: also a surface of which only parts are shining. Microchaetae: small bristles, as opposed to macrochaetae, in Diptera. Microergates: the dwarf workers among ants. Micron: the unit of microscopic measurement = 001 mm.: represented by the symbol mu: the symbol mu mu represents .001 of a micron. {Scanner's note: the mu mu notation would no longer be valid.} Micropterous: small winged. Micropterism: the tendency to produce small wings; applied to a line of variation. Micropyles: minute openings in the egg, through which spermatozoa enter. Microsomites: small secondary rings or somites of the macrosomites in the embryo, which afterward become the body segments. Microthorax: a supposed thoracic ring between the head and prothorax. Middle apical area: = internal area; q.v. Middle field: = discoidal field; q.v. Middle lobes: of pronotum in Orthoptera; see lobes. Middle pleural area: in Hymenoptera; the median of the three areas between lateral and pleural carinae: = 2d pleural area. Mid-dorsal thoracic Carina: a ridge or elevated line at the meeting of the mesepisterna in Odonata. Mid-gut: the chylific ventricle with the caecal glands, tubes or pouches. Mid-intestine: = mid-gut. Migrants: applied to that brood of plant lice which flies from one to an alternate food plant: any forms that fly from the place where they were born for food or other purposes. MM.: = Millimeter: .001 meter = .039 of an inch: roughly 25 mm. are counted to an inch in measuring insects. {Scanner's comment: modern usage is lower case. So: mm.} Mimetic: when a species mimics or resembles another or some other object in appearance; but not in structure and other characters. Mimicry: strictly, the resemblance of one animal to another not closely related animal, living in the same locality; often loosely used to denote also resemblance to plants and inanimate objects: Batesian mimicry is where one of two similar species is distasteful (so-called model), the other not distasteful (so-called mimic); Muellerian mimicry is where both species are distasteful. Mines: applied to galleries or burrows between upper and under surface of leaf tissue, when made by larvae: they are linear, when they are narrow and only a little winding; serpentine, when they are curved or coiled, becoming gradually larger to a head-like end: trumpet-mines, when they start small and enlarge rapidly at tip; blotch mines, when they are irregular blotches tentiform, when the blotch mines throw the leaf into a fold on one side. Miniate -us: of the color of red lead [vermilion with a slight admixture of dragon's blood]. Mirror: in Cicada; see specular membrane. Mitosoma: the middle piece of a developing spermatozoon. Mobile: movable: having the power of motion. Model: see mimicry. Modioliform: globular, truncated at both ends; like the hub of a wheel.