r bladelike process projecting from the epidermis.

Rhabdom: the rod lying in the axis of the retinula, below the
crystalline cone of an eye.

Rhabdomere: the rod-like distal portion of a retinular cell.

Rhabdopoda: clasping organs of the 9th abdominal segment of male.

Rhinarium: a nostril piece or portion of the nasus: q.v.: in Odonata,
the lower portion of clypeus = ante-clypeus; q.v.

Rhipiptera: = Strepsiptera q.v.

Rhomboidal: having the form of a rhomb.

Rhombus: a quadrangular figure having its four sides equal and its
opposite lines parallel, with two opposite angles acute and two obtuse.

Rhopalocera: that series of Lepidoptera in which the antenna are alike
in both sexes and form a club at tip.

Rhodoptera: apterous insects with sucking mouth structures.

Rhophoteira: an ordinal term for the fleas (Clairville).

Rhynchophora: that section of Coleoptera, in which the head is
produced into a snout, at the end of which the mouth structures are
situated; gular sutures confluent: prosternal sutures wanting: the
weevils.

Rhynchota: = Rhyngota: q.v.

Rhynchus: of Fabricius, = promuscis: q.v.

Rhyngota: insects in which the mouth parts are prolonged into a beak
or rostrum which serves as a protection to the piercing lancets:
Hemiptera in the broad sense.

Rhythmical: occurring at regular intervals in the production of
opposite conditions.

Rigid: inflexible: holding a direct course.

Rima: a crack or longitudinal opening with sharp edges.

Rimose: full of cracks.

Ring: a circle or annulus, usually margining a discolored spot.

Ringent: gaping.

Riparian: along the river or along shore.

Ripicolous: dwelling on river banks: riparian.

Rorulentum: dusty: =pulverulent: q.v.

Roseate-eous,-ens: rose colored: pale blood red [rose].

Rosette-shaped: in the form of a double rose: clustered round a
centre.

Rostellum: a small beak; applied to the mouth parts of sucking lice:
also used in Hemiptera, as = rostrum; q.v.

Rostral: pertaining or attached to a rostrum; specifically of
Hemiptera.

Rostrate: the head, when it has a long protraction bearing the mouth
parts.

Rostriform: produced like a beak or snout.

Rostrum: a snout-like prolongation of the head: in Coleoptera,
applied to the rigid extension in the snout beetles: in Hemiptera, is the
jointed beak covering the piercing lancets; and this is the better use
of the term.

Rotate: wheel-shaped.

Rotator: used for turning; ap