Luteous -eus: clay yellow [pale clay yellow].
Lutescent: becoming or appearing to be clay yellow.
Lutose -us: apparently or really covered with dirt.
Lymphatic: producing, carrying or relating to the lymph.
Lyrate: lyre-shaped: cut into several transverse segments, and gradually enlarging towards the extremity.
Lyre: the upper wall or border of the spinning tube of caterpillars.
Macrochaetae: the long bristles occurring singly on the body of Diptera.
Macrosomites: the primitive regions of primitive hand of the insect embryo.
Macula: a colored mark larger than a spot; of indeterminate figure.
Maculate -ed: spotted or marked with figures of any shape, of a color different from the ground.
Maculation: the ornamentation or pattern of marking.
Maculose: spotted; with many marks or spots.
Maerianum: "that segment of the post-pectus situate one on each side behind the acetabulum and parapleurum"; it supports the posterior feet: see meriaeum.
Magenta: pinkish red; an aniline product.
Maggot: applied to the footless larvae of Diptera.
Mala: a lobe: a ridged or grinding surface.
Mala mandibularis: the grinding surface or area of a mandible.
Mala maxillae: the globes of maxilla; outer or galea, inner or lacinia; where only one is present, the term refers to that one.
Malaxation: a kneading or softening; applied to the chewing and squeezing by fossorial wasps of insects captured as food for their larva.
Male: that sex having organs for the production of spermatozoa: designated by "?", the astronomical sign for Mars. { Scanner's comment: The sign for Mars being an diagonal arrow rising from a circle, and pointing upwards towards the right.}
Mallophaga: wool-eaters: an ordinal term applied to biting lice: wingless: mandibulate; thoracic segments similar; no metamorphosis: =Lipoptera.
Malpighian tubules: long, slender tubules, varying in number, serving as excretory organs, entering the alimentary canal at the point of junction of chylific ventricle and ileum: said to be analogous with kidneys: = biliary vessels.
Mammilate: with nipple-like protuberances or processes.
Mandible: the lateral upper jaws of a biting insect.
Mandibular strobe: a broad deep groove on outer side of mandible in some Coleoptera.