the
hinder part of each eye.

Oculi -us: the eyes: an eye: refers to the compound eyes.

Oculocephalic: applied to that pair of imaginal buds destined to
produce the cephalic region in Hymenoptera.

Odona: toothed: applied to Odonata by Fabricius because of the long
teeth on the maxilla and labium.

Odonata: net-veined insects with mandibulate mouth; head free;
thorax agglutinate; wings similar, elongate, flat; metamorphosis
incomplete; copulatory organs of male near base of abdomen,
separate from the testes. {Scanner's comment: Dragon flies
and damselflies}

Odonate: bearing toothed mouth parts, like those of dragon flies.

Odoriferous: diffusing an odor; applied to glands or secreting organs.

OEcology: see ecology.

OEdagus: the penis.

OEnocytes: large yellow cells arranged segmentally in clusters, in each
side of body cavity: associated with blood and fat bodies.

OEsophageal bone: a plate below anterior part of oesophagus in
Psocidae.

OEsophageal bulb: = sub-clypeal pump; q.v.

OEsophageal diverticula: = food reservoirs (q.v.); but more generally
applied also to any sac-like structure connected with the gullet.

OEsophageal lobes: form posterior portion of brain or tritocerebrum.

Oesophageal valve: a funnel-like folding of the oesophagus, extending
into the chylific ventricle in some insects, and forming a valve that
controls the entrance of food into that organ: = cardiac valvule.

Oesophagus: the gullet: that part of the alimentary canal between the
mouth and the crop.

Olfactory: pertaining to the sense of smell: those lobes of the
deutocerebrum from which the nerves supplying the antennae arise.

Oligonephria: applied to insects with few urinary (Malpighian) tubes.

Oligoneura: having few wing veins: specifically applied in Diptera to
Cecidomyids.

Olivaceous: with a tinge of olive-green, usually as a shading [olive
green].

Omaloptera: the pupiparous flies.

Omia: the shoulders: the lateral anterior angles of an agglutinated
thorax, when they are distinct:= see umbone: in Coleoptera; a
corneous sclerite to which the muscles of the anterior coxa are
attached; also the lateral margin of the prothorax; also the lateral
margin of the scutellum in Carabids and Dytiscids.

Ommateum: the compound eye.

Ommatidium -ia: one of the elements of which the compound eye is
composed.

Omnivorous: a general feeder upon animal or vegetable food, or both.

Oncus -i: a welt: applied to welt-l