Retuse: ending in an obtuse sinus or broad, shallow notch, terminated by an obtuse hollow. Reversed: turned in, an unusual or contrary direction, as upside down or inside out: said of wings when they are deflexed, the margin of secondaries projecting beyond those of primaries. Reviviscence: coming back to life; awakening from hibernation. Revolute: spirally rolled backward. Rhabdites: the blade-like elements of the sting and ovipositor: a rod or 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; applied to muscles. Rotatory: an articulation that permits a rotating motion, e.g. a ball and socket joint.