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 of the palpifer, to which muscles for flexing the proboscis are attached: see lora. Maxillary tentacle: in female Pronuba: a specialized process of palpifer. Maxillulae: a pair of appendages in Thysanurids, between mandibles and first maxillae. Maxime: very much or very large. Mealy: with a flour-like dusting: = farinose. Mecaptera: = Mecoptera, q.v. Meconium: the substance excreted by certain metabolic insects soon after their emergence from the chrysalis or pupa. Mecoptera: long-winged: neuropterous insects with similar, large, unfolded wings; mouth mandibulate, prolonged into a beak: head free; thorax agglutinated; transformations complete: the scorpion flies or Panorpidae. Medi-: prefix, = middle. Media: the fourth of the longitudinal veins extending from base through approximately the middle of the wing, not more than four branched, the branches numbered on margin from nearest apex, to 4 nearest anal angle: in Orthoptera; it is the median or externomedian: in Lepidoptera (Pack.), is cubitus (Comst.). Mediad: toward the median plane or middle. Mediafurca: a process extending internally from the meso-sternum, to which the muscles are attached. Medial: referring to, or at the middle. Medial cells: (Comst.), are anteriorly bounded by the media or its branches: in Hymenoptera (Mort.), includes median and cubital (Comst.) Medial cross-vein: (Comst.), is between media 2 and 3. Median 1: in Lepidoptera (Pack.), = media 2 (Comst.). Median 2: in Lepidoptera (Pack.), = media 3 (Comst.). Median 4: in Lepidoptera ( Pack.), = cubitus 2 (Comst.). Median area: of wings in Orthoptera, lies between the radial and ulnar veins, radius and media (Comst.): of meta-thorax of Hymenoptera, is the middle of the dorsum, divided into three spaces or cells; 1st or basal area, 2d or Lipper median or areola; 3d or apical or petiolar area.