USED IN ENTOMOLOGY. 117 



t 



Retractor: used in drawing in or back; as a muscle. 



Retroarcuate: curved backwards. 



Retrocession: the going or moving backward. 



Retrose: (sinuate) pointing backwards ; (serrate) inversely serrated. 



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 



blade-like 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 antennas 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 Coleoptcra 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, -eus: rose colored; pale blood red [rose]. 

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



