Part 89

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 to the ecto- or meta-blast or ectoderm.

Metabola: insects with a complete metamorphosis in which the larva does not resemble the adult, and the pupa is quiescent.

Metabolism: is transformation: the whole process or series of changes of food into tissue and cell-substance and of these latter into waste products the first of these changes being anabolic, the second katabolic.

Metabolous: undergoing metamorphosis or transformation.

Metacoxal plate: in Coccinellidae, that portion of the first ventral segment included above the ventral lines visible on that segment.

Metagnatha: insects which feed with jaws when young and by suction, with tubular mouths when mature; e.g. the Lepidoptera: see menognatha and menorhyncha.

Metagonia: the hind or anal angle of a wing.

Metallic: having the appearance of metal: applied to a surface or color.

Metaloma: the sutural or inner margin of primaries.

Metamere: a segment, somite or athromere.

Metameric: made up of segments or metameres.

Metamerism: the arrangement in metameres.

Metameros: in Lepidoptera. the 6th to 8th abdominal segments.

Metamorphosis: is that series of changes through which an insect passes in its growth from egg through larva and pupa to adult: it is complete when the pupa is inactive and does not feed; incomplete when there is no pupa or when the pupa is active and feeds.

Metamorphosis dimidio: an incomplete transformation.

Metamorphosis perfecta: a complete transformation.

Metanotum: the primitively upper surface of the third or posterior thoracic ring: in Diptera, the oval arched portion behind, beneath the scutellum best developed in flies with long, slender abdomen: e.g. Tipulidae.