Epistoma -is: the lower face between the mouth and eyes: that sclerite immediately behind or above the labrum, whether it be clypeus or an intermediate piece: in Diptera, that part of the face between the front and the labrum; the oral margin and an indefinite space immediately contiguous thereto and so = peristoma: in Odonata; = clypeus: = hypostoma.
Epithelium: the layer of cells which covers a surface or lines a cavity.
Epizoa: insects that infest the body surface of animals.
Epizoötic: living or parasitic on animals from the outside or on the surface.
Epomiae: the elevated margin of an oblique furrow in the propleurae for the reception of the front femora; Hymenoptera.
Epupillate: an ocellate spot included by a colored ring, but destitute of a pupil or central spot.
Equal: of the same length, size or shape: the superfices when they are without inequalities.
Equitant: laminated: folding one upon the other.
Erect: standing upright; not necessarily perpendicular.
Erectile: capable of being erected; applied to an appendage, a hair or other process, or to any tissue which may be distended and made rigid.