Part 100

Ora coleopterorum: the margin of the elytra.

Orad: toward the mouth.

Oral: pertaining to the mouth.

Oral cavity: the mouth; = buccal cavity.

Oral fossa: in Mallophaga, a furrow lying in front of the mandibles.

Oral segment: that ring or segment which bears the mouth.

Orbicular: round and flat, the diameters of the plane equal: in sonic moths, a round or oval macula in the median cell.

Orbit: an imaginary border around the eye: in Diptera the orbits are divided into vertical or superior; frontal and facial or anterior; of the cheek or inferior; occipital or posterior.

Orbital sclerite: a narrow sclerite encircling some eyes.

Order: one of the primary divisions of the Class Insecta, based largely on wing structure and then usually ending in -ptera.

Ordure: excrement; usually applied to such as is foul or offensive.

Orichalceous: = aurichalceous; q.v.

Oriental: in geographical zoology as used by Wallace, that part of the earth's surface including Asia east of the Indus River, south of the Himalayas and the Yangtse-kiang watershed, Ceylon, Sumatra, Java and the Philippines.

Orificium: the anal or genital opening.

Original type: is the actual specimen from which a published description is prepared.

Orismologia -y: the defining of scientific or technical terms.

Orthoptera: straight winged: an ordinal term applied to insects in which the primaries are not used in flight, but cover the longitudinally folded secondaries; mouth mandibulate; head set into prothorax, the latter free; metamorphosis incomplete.

Orthorrhapha: that section of Diptera in which the pupa escapes from larval skin through a T-shaped opening on back: see cyclorrhapha.

Orthorrhaphous: straight-seamed.

Os: the mouth of insects, in general.

Oscillation: a vibrating or swinging from side to side.

Osculant: intermediate in character between two groups or series.

Osmaterium -ia: fleshy, tubular, eversible processes producing a penetrating odor, capable of being projected through a slit in the prothoracic segment of certain Papilionid caterpillars, and from openings elsewhere in the bodies of other forms. {Scanner's comment: currently the only spelling I can find is "osmeterium". This given spelling is almost certainly an error on someone's part. Not only do the earliest books that I can find spell it "osmeterium", but the Greek root is "osme".}

Osmosis: the tendency of liquids to pass or diffuse through a membrane or septum.

Osselet: = ossicle; q.v.

Ossicle: a small nodule of chitin resembling a bone.

Ossicula: small corneous pieces that serve in the articulation of the wings to the thorax.

Ostia: the slit-like openings of the heart.