wrapped in a hard covering.

Obtected: applied to pupae when they are covered with a chitinous
case which confines and conceals all appendages, though their
outlines may be marked on the surface: see free, and coarctate.

Obtuse: not pointed: an angle greater than a right angle: opposed to
acute. Obtuse-angulate: two markings or margins meeting so as to
form an obtuse angle.

Obtusilingues: short-tongued bees with the tip obtuse or bifid: see
acutilingues.

Occipital foramen: the opening in the occiput, opposed to a similar
opening in the prothorax: = foramen magnum.

Occipital margin: in Mallophaga, the posterior margin of the head.

Occipito-orbital bristles: in Diptera; situated on posterior orbit of eye.

Occiput: that part of the head behind the vertex: in Diptera, the whole
posterior surface of the head: in bees, the space between the vertex
and the neck.

Occlusor: applied to muscles which close an opening; e.g. spiracles.

Occult -us: hidden; concealed from superficial view.

Ocellar bristles: in Diptera, are situated close to the ocelli, usually
directed forward: often absent.

Ocellar ribband: a crescent-shaped, smooth thin belt across the eye
region in butterfly chrysalids.

Ocellar triangle: a triangle, indicated by grooves or depressions, on
which the ocelli are situated; Diptera.

Ocellate: eye-like in appearance: in Lepidoptera, spots on the wings,
bordered by a colored iris or ring, and usually with a pupil.

Ocelli: plural of ocellus; q.v.; = stemmata.

Ocelligerous: supplied with, or bearing ocelli.

Ocellus: a simple eye, consisting of a single convex or bead-like lens,
which conveys an image to a retina.

Ocelli occur in larvae and, singly or in small groups, in adults: the
compound eyes are made up of numerous ocelli.

Ochraceous: yellow with a slight tinge of brown [pale cadmium yellow
and brown ochre].

Ochraeus -eus: = ochraceous.

Ochro-leucus: dilute ochraceous.

Ocular emargination: in Mallophaga, a lateral emargination of the
head in which the eye is received posteriorly.

Ocular fleck: in Mallophaga, a small, intensely black spot of pigment
in the eyes.

Ocular fringe: in Mallophaga, closely set small hair on posterior half of
ocular emargination, sometimes extending on temporal margin.

Ocular lobes: of brain = procerebrum; q.v.

Ocular sclerite: the first or protocerebral segment of the head.

Ocular tubercles: in Aphids, are a group of prominent facets on