Riparian: along the river or along sh.o.r.e.

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: cl.u.s.tered 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.

Rotula: a small round segment sometimes present between the joints of antenna; and palpi: = torquillus.

Rotule: the trochantine.

Rotundate: rounded: in the form of a circle or segment of a circle: without angles: said of margins when they pa.s.s gradually into each other and do not form an angle at their point of junction.

Royal jelly: the food supplied to bee larva that develop into queens.

Royal pairs or Royalties: the s.e.xually active males and females of social insects.

Ruben: red, approaching carmine [alizar crimson].

Rubescent: reddish or becoming red.

Rubiginose: a rusty red [dragon's blood, but brighter].

Rubinous: ruby red: like the eye of a house fly.

Rudiment -any: the beginning of any structure or part before it has developed.

Rufescent: reddish.

Rufous: brick-red [chronic yellow + dragon's blood].

Ruga, Rugulae: a wrinkle; small wrinkles.

Rugose -ous: wrinkled: with irregular waved elevated lines.

Rugulose -ous; minutely wrinkled.

Runcinate: notched: cut into several transverse acute segments which point backward.

Ruptor ovi: = egg burster; q.v.

Rutilous: a shining bronze red.

S

Sabulose: sandy or gritty.

Sac: in Coccidae, the separate cottony envelope secreted by many species.

Saccate: gibbous or inflated toward one end.

Saccule: a little sac or pouch.

Saccus: a lobe of ventral plate of 9th segment in female Lepidoptera.

Saddle: the chitinous plate on the a.n.a.l siphon of Culicid larvae.

Sagitta: arrow-like spots on the wings of Lepidoptera and other insects.

Sagittae: the inner pair of forceps in male genitalia of aculeate Hymenoptera: see stipites.

Sagittal: equivalent to longitudinal.

Sagittal plane: the longitudinal vertical plane which divides an animal into right and left halves.

Sagittate: shaped like an arrow head: elongate triangular.

Salient: projecting; jutting out.

Saliva: the secretion of the salivary glands that moistens and begins the digestion of the food.

Salivary glands: glands that open into the mouth or at the beginning of the alimentary ca.n.a.l, secreting a digestive, irritant or viscid material.

Salivary receptacle: a small cavity above the opening of the salivary duct, between labium and hypopharynx.