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.