Part 117

Primitive: simple in character; of an early or ancient type.

Principal sector: in Odonata, extends from its point of separation From the median sector to the outer margin, at or just below the apex:= media 1 (Comst.).

Principal sulcus: in Orthoptera, a transverse impression of the prothorax, at or behind the middle.

Priodont: applied to those forms of male Lucanids that have the smallest mandibles: see teleodont, mesodont, amphiodont.

Prismatic: formed like a prism: a play of colors similar to that produced through a prism.

Pro-: anterior: used as a prefix to designate the parts of the first thoracic segment.

Proboscidea: an ordinal term for the Coccidae.

Proboscis: generally applied to any extended mouth structure; usually applied to the extensile mouth of the Diptera; frequently to the beak of Hemiptera; sometimes to the tongue of Lepidoptera; and rarely, to the mouth of long-tongued bees.

Procephalic: relating or belonging to the procephalon.

Procephalic lobes: in the embryo, form part of the anterior, overhanging portion of the head.

Procephalon: that segment of the head in the embryo which is formed by the coalescence of the first three primitive segments.

Procerebral: that segment of the brain containing the median protocerebrum and optic ganglia; also called optic segment.

Procerebral lobes: the central portion of the cerebrum, made up of the fused median lobes, giving rise to the mushroom bodies; q.v.

Procerebrum: the anterior part of the brain, formed by the ganglion of the first primary segment; also termed ocular lobe, froth part it innervates. Process: a prolongation of the surface, margin, or an appendage: any prominent portion of the body not otherwise definable.

Process of labrum: in bees = appendicle: q.v.

Procidentia: the narrow projecting tip of 7th dorsal segment in Nematinae.

Proclinate: directed forward; applied to hair or bristles.

Proctodaeum: the invagination of epiblast that produces the anus and intestine as far forward as and including malpighian tubes.

Proculiform or Poculiform: hollow, cylindrical, with a hemispherical base, the sides at top straight goblet-shaped.

Procumbent: trailing; prostrate; lying flat.

Produced: drawn out; prolonged; extended from.

Proeminent: said of the head when it is horizontal and does not form an angle with the thorax.

Profile: the outline as seen from the side.

Profound, Profundus: deep.

Prognathus: having the jaws directed forward.

Progoneate: with the genital opening on an anterior body segment.

Progonia: the anterior angle of the secondaries.

Proleg: any process or appendage that serves the purpose of a leg: specifically the fleshy unjointed abdominal legs of caterpillars and certain saw-fly larvae: = abdominal feet: false legs.