Endoskeletal: relating or referring to the endoskeleton. Endoskeleton: applied to those chitinous processes extending inward into the body cavity from the body wall and serving as attachments for muscles. Endosternite: that part of the apodeme arising from the intersternal membrane. Endothorax: the internal framework or processes of the thorax. Endotoky: is applied to that form of reproduction where the eggs are developed within the body of the mother; see exotoky. Endotrachea: the inner surface or lining of the trachea: see intima. Enervis: applied to wings without veins of any kind. Engraved: see exsculptus. Ensiform: sword-shaped: two-edged, large at base and tapering to the point: see anceps. Entad: extending inwardly from without. Ental: referring to the centre of the body cavity. Enteric: relating to the digestive canal or enteron. Enteron: the digestive canal as a whole; a general term. Entire: with an even unbroken margin: said of wings when they are not divided or cut into. Entoderm: the innermost germ layer of the embryo, from which are derived the epithelium of the alimentary canal and accessory structures: = endoderm and hypoblast. Entognathous: see entotrophous. Entoloma: the inner margin of the wings. Entomogenous: growing in or on an insect: e.g. fungi. Entomography: the description of an insect or of its life history. Entomolin: = chitin, q.v. Entomologist: one who collects and studies insects. Entomology: that branch of Zoology that deals with insects and, specifically, the Hexapods. Entomophagous: feeding upon insects: specifically applied to those wasps that feed their young with larvae, etc. Entomophilous: insect-loving: applied to plants especially adapted for pollination by insects. Entomophytous: referring to plants produced in or on an insect: see Entomogenous. Entomosis: a disease caused by a parasitic insect. Entomotaxy: the preservation and preparation of insects for study. Entomotomy: that science which deals with internal structure of insects. Entomotomist: a student of insect structure. Entosternum: the internal processes from the sternum. Entothorax: applied to the apodemes or processes extending inwardly from the sternal sclerites: see apophysis. Entotrophous: with the mouth parts buried in the head:= entognathous: see ectotrophous. Entozoa: those animals that live within the body of others. Environment: the sum of the influences surrounding or acting upon an organism. Enzyme: a ferment secreted by a cell or a gland. Epalpate: having no palpi. Ephebic: referring to the winged, adult stage. Ephemerida: May-flies: an ordinal term used for insects with net-veined wings, held vertically when at rest, not folded; mouth mandibulate, not functionally developed: thorax loosely agglutinated; abdomen with anal filaments: metamorphosis incomplete. Ephemeroptera: briefly winged: = ephemerida; q.v. Epiblast: the outer germ layer of the embryo.