pieces of mesothorax,
meeting dorsally in a ridge.

Mesially: at or to the middle.

Mesinfraepisternum: a sclerite formed between propleuron,
mesepisternum, mesepimeron and second coxa.

Meso: middle: as prefix, drops the o when stem begins with a vowel.

Mesoblast: the middles germ layer of the embryos: = mesoderm.

Mesoderm:= mesoblast: gives rise to muscular and circulatory
systems.

Mesodont::= amphiodont: q.v.

Mesomeros: the 2d to 5th abdominal segments in Lepidoptera.

Meson: the middle plane of the body.

Mesonotum: the primitively upper surface of the 2d or middle thoracic
ring.

Mesophragma: an internal prolongation of the metapraescutum,
affording attachment to some of the wing muscles.

Mesopleura: in Diptera, the space before the root of the wing between
the dorso- and sternopleural sutures: in Hymenoptera, the piece
below the insertion of the wings.

Mesopleural bristles: in Diptera, are inserted in the angle formed by
the dorso-pleural and meso-pleural sutures.

Mesopleural suture: in Diptera, runs from the root of the wings
downward and separates the meso-pleura from the pteropleura.

Mesopleuron: the lateral surface of the meta-thorax.

Mesosternal cavity: in Elateridae, the opening into which the
prosternal spine or mucro is fitted.

Mesosternal epimera: in Coleoptera; the narrow pieces separating the
meta-sternal from the meta-sternal episterna.

Mesosternal episterna: Coleoptera; on each side of mesosternum
between anterior border and epimera; generally separated by a
distinct suture.

Mesosternal lobes: in Orthoptera; = mesosternellum, q.v.

Mesosternellum: in Orthoptera, two median lobes of the mesosternum,
one on each side of the deep median notch: in general,
the sternellum of the mesothorax.

Mesosternum: the underside or breast of the meta-thorax.

Mesostethidium: = meso-thorax: q.v.

Mesostethium: the middle piece of the underside of meta-thorax,
between the middle and hind legs.

Mesostigma: in Odonata, the spiracles of second thoracic segment.

Mesosulcus: a central longitudinal furrow of mesosternum in
Hymenoptera.

Mesotarsus: the tarsus of the middle leg.

Mesothoracotheca: the pupal covering of the meso-thorax.

Mesothorax: the second or middle thoracic ring; bears the middle legs
and the anterior wings.

Mesotergum: = mesonotum; q.v.

Meta-: posterior: used as a prefix to designate the third thoracic ring
and its parts.

Metablastic: relating t