Manubrium: in Coleoptera: that part of the mesosternum in Elateridae
which forms the process for fitting into the cavity of the prothorax: in
Collembola the basal part of the furculum.

Manus: the hand: formerly applied to the anterior tarsus.

Marbled: irregularly mottled, gray and white, like marble; =
marmoratus.

Marcescent: shrivelling.

Margaritaceous: shining, like mother of pearl = nacreous; q.v.

Margin: that portion of a surface within the edge, bounded on the
inner side by the sub-margin and consisting of a more or less dilated
imaginary line.

Marginal: of, belonging to, or near the margin.

Marginal area: in Orthoptera; see mediastinal area.

Marginal bristles: in Diptera; are inserted on the posterior margin of
the abdominal segment.

Marginal cell: in Diptera (Williston):= subcostal (Shiner):= radial
(Comst.): in Hymenoptera:= radial and 2 (Comst.): in general that
cell beyond the stigma.

Marginal field: in tegmina = costal field: q.v.

Marginal nervure or vein: in Orthoptera, = costa (Comst.): in
Hymenoptera (Norton) = radius 3 (Comst.): in general, the vein
forming the marginal cell.

Margined -ated: bounded by an elevated or attenuated margin: when
the margin is edged by a flat border.

Marmorate -us: spots and lines irregularly disposed, as in marble:
marbled. Mask: in the nymphs of Odonata, the modified labium
which, when at rest, conceals the other mouth parts.

Masticate: to chew.

Masticatory: formed for chewing or grinding; applied to the mouth
parts and to the grinding structures in the gizzard.

Mastigium -ia: telescopic anal organs in certain caterpillars, serving
to repel attacks of parasites.

Matrix: the formative substance from which cells and other structures
are derived.

Maxilla: without any qualifying adjective, the second pair of jaws in a
mandibulate insect; the most persistent when the mouth is modified,
and represented by some functional part in all insects in which the
mouth structures are useful: second maxillae, = the labium, or third
pair of jaws in a mandibulate insect.

Maxillary: attached or belonging to the maxilla; e.g. palpi.

Maxillary palpi: the first pair of palpi, borne on the maxilla.

Maxillary pleurites: the lateral pieces, epimera and episterna of the
maxillary segment.

Maxillary segment: the sixth segment of the head, bearing the
maxillae.

Maxillary tendons: two slender rods in basal third of the
muscid proboscis the remnant o