ligula: a tongue-like process on the inner face of the side
margin of elytra, to perfect the union with the ventral segments: e.g.
in Dytiscidae.

Elytriform: shaped or appearing like an elytron.

Elytrin: = chitin, q.v.

Elytron: singular of elytra; q.v.

Elytroptera: see Coleoptera.

Emandibulata: that series of insects in which there are no functional
mandibles in any stage.

Emandibulate: lacking functional mandibles; e.g. butterflies and
moths, and applied in any stage.

Emarginate: notched: with an obtuse, rounded or quadrate section cut
from a margin.

Embolium: Heteroptera; the narrow sclerite extending along the
anterior margin of the hemelytra, from base to cuneus or membrane:
the lobes on each side of the prothorax: the special enlargement at the
base of the primaries which fits into a cavity in which the wing is
moved.

Embossed: ornamented with raised figures.

Embryo: the young animal before leaving the body of the parent or
before emerging from the egg.

Embryonic: found in, or relating to the embryo; in an undeveloped
state or condition.

Emmet: an ant.

Empodium: Diptera; the small process between the pulvilli: in
Coleoptera; the bifid pseudotarsi between the claws: used also as =
pulvillus; and see arolium, onychium, palmula, paronychium,
plantula, pseudonychium and pulvillus.

Enarthrosis: an articulation like a ball and socket joint.

Encephalon -um: the brain, or that part of the head containing it.

Encircled: ringed; margined round about.

Endemic: occurring normally where found: native, not introduced.

Endocardium: the inner lining membrane of the heart.

Endochorium: the layer of the allantois that lines the chorium; the
inner layer of the chorium.

Endocranium: the inner surface of the cranium.

Endoderm: the inner layer of the blastoderm in the embryo, giving
origin to the mid-intestine and other visceral organs: see entoderm.

Endolabium: the inner or mouth surface of the labium: the
hypopharynx when that is well developed.

Endomesoderm: the inner layer formed by an invagination of the
middle portion of the primitive band of the embryo, and from which
the endoderm and mesoderm are subsequently differentiated.

Endophytic: living within plant or tree tissue, as borers or miners.

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 a