ax: 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.

Mola or Molar: the ridged or roughened grinding surface of the
mandible: when the mandible is compound, the molar corresponds to
the subgalea of maxilla.

Monarsenous: that kind of union where one male suffices for many
females.

Moniliform: beaded like a ne