R

Radial cellule. - A portion of the membrane of the wing, situated near the apex, included between the exterior margin and a nervure which originates at the carpus and passes, with various degrees of curvature, towards the apex. (From L. radius, a ray, and cella, a cell.)

Radial nervure. - A radiating or cross nervure of the wing. (L. radius, and Gr. neuron, a nerve, cord.)

Radiate. - When a dot, spot, etc., appears to throw off rays; ex. the large blue area common to the wings of Papilio. (L. radius.)

Radicle. - The basal joint of the antennæ. (Fr. from L. radix, a root.)

Radicula. - The radicle. The basal joint of the antennæ (Say). (L. a small root.)

Radio-medial nerve. - A transverse or cross-nervure of the wing connecting the radial and medial nerve systems. (L. radius, medius, the middle, and nerve.)

Radius. - The area lying between the costal cell or area, and the media of the wing. (L. a ray.)

Radius. - The first nervure of the exterior edge of the superior wing; it extends from the base to the carpus, and is separated from the cubitus, by a membrane. (L.)

Ramosæ. - (Antennæ.) When setaceous or moniliform, but having long branches from several of the joints. (L. ramosus, full of branches.)

Ramose. - Branching; branched; possessing branches; resembling branches. (L. ramosus.)

Raptorial, Raptorious. - Adapted for seizing and devouring prey. (L. raptor, a robber, from rapio, to rob.)

Re-. - A Latin prefix, signifying back.

Receptacula ovorum. - Portion of the female genitalia, the receptacle holding the eggs or ova. (L. receptaculum, and ovum.)

Reclivate. - Curved in a convex, then in a concave line. (L. re, and clivus, a projection, a bill.)

Recondite. - (Aculeus.) - Concealed within the abdomen, seldom exposed to view. (L. re, and condo, to put together.)

Rectate. - Straight; straightly upright. (L. rectus, straight.)

Rectigrade. - Larvæ which have sixteen legs, and can walk with a rectilinear body. (L. rectus, and gradus, a step.) See Geometræ.

Rectum. - The short dilated terminal part of the intestines connecting with the anus. (L.) See Intestines.

Recurrent nerve. - A single median nerve cord arising from the caudal border of the frontal ganglion, extending back beneath the supraœsophageal ganglion to the vagus, or ventricular ganglion. (L. re, and curro, to run.)'

Recurvate, Recurved. - Bent or bowed backwards. (L. re, and curvus, curved.)

Recurvate. - Bowed, or bent downward. (L. re, and curvus.)

Recuspine. - Having the points in a backward direction. (L. re, and cuspis, a point.)

Reflex. - Bent up, opposed to deflex. (L. re, and flecto, flectum, to bend.)

Reflexed. - Having raised margins. (L. re, and flecto, flectum.)

Remiform. - Oar-shaped. (L. remus, an oar, and forma.)

Remiped. - With oar-shaped feet; ex. aquatic insects whose legs serve as oars. (L. remus, and pes, foot.)

Remote. - Further removed than distant; not near. (L. remotus, from removeo, to remove.)

Reniculus. - A small kidney-shaped spot of colour. (L. renis, a kidney.)

Reniform. - Having the form or shape of the kidneys. (L. renes, kidneys, and forma form.)

Repand. - Cut into very slight sinuations, so as to run in a serpentine direction; having an uneven sinuous margin. (L. re, and pando, to spread.)

Repandous. - Bent upward; crooked. (L. re, and pando.)

Repicate. - Refolded, doubled back or down, capable of being folded back. (L. re, and plico, to fold.)

Resilient. - Having the property of springing back. (L. resilio, to leap back.)

Respiratory nerves. - The lateral branches arising from the median nerve and extending laterally over the nerves of the central or main nervous system. (L. respiro, to breathe, from re, again, and spiro, to blow; and nerve.)

Resuspinate. - Upside down; horizontally reversed. (From L. re, and suscito, to raise.)

Retecious. - Resembling network. (L. rete, a net.)

Reticular. - Having the form of network. (L. reticulum, a little net.)

Reticulate. - Covered with a network of lines or cross striæ; netted; resembling network. (L. reticulatus, from reticulum.)

Reticulate. - (Egg.) Sculptured. (L. reticulatus a net.)

Reticulose, Reticulated. - Having a number of minute impressed lines which intersect one another like the meshes of a net. (L. reticulatus.)

Retina. - A retiform expansion of the optic nerve of the eye, which receives the impressions conveyed through the transparent facets, cones, and rods, and gives rise to vision. (L. retina, so called because it resembles network. Coined from reti - for rete, a net.)

Retinal. - Pertaining to the retina. (L. retina.)

Retinaculum. - Horny movable scales with which the spicula are furnished, serving instead of muscles to prevent it being darted out too far. (L. a stay; from retino, to hold back, and aculeus, a sting.)

Retinula. - Elongate nerve-cells in the structure of the eye. (L. retina.)

Retracted (retractum). - (Head.) When it is concealed as far as the brow within the thorax. (L. re, traho, tractum, to draw back.)

Retractile. - Capable of being produced and withdrawn. (L. retractum.)

Retractile. - (Head.) When a concealed head can be pushed forwards at the will of the insect. (L. re, and traho, to draw.)

Retractores ventriculi. - The delicate retractor muscles which assist in supporting the alimentary canal. (L.)

Retractum. - (Head.) [See Retracted.]

Retro-. - A Latin prefix signifying backwards.

Retrorsum. - (Direction.) Backwards; in a backward direction. (L.)

Retrose. - Backward; in a backward direction. (L. retro.)

Retuse. - Possessing blunt impressions, as if beaten into the surface. (L. re, and from tundo, tusum, to beat.)

Reverse. - When an object is viewed with the anus towards you. (M.E. reuers (revers). - O.F. revers. - L. reuersus, lit, turned backwards. L. re-, back, and uertere, to turn.)

Reviviscence. - The awakening from torpidity, the restoration from suspended animation. (L. reviviscens, from revivisco, to come to life again, to revive.)

Revoluted. - Rolled or curled back. (L. re, and from voluto, to roll.)

Rhabdites. - The three pairs of slender non-articulated tubercles constituting the ovipositor. (Gr. rhabdos, a rod.)

Rhabdom. - The nerve rod supporting the apex of the blunt crystalline cone of the eye. (Gr. rhabdos.)

Rhabdomeres. - The sections of the rhabdom. (From Gr. rhabdos.)

Rhabdopoda. - The genital claspers. (Packard.) (Gr. rhabdos, and pod, pedis, a foot.)

Rhinarium. - The nostril-piece; the space between the anterior margin of the nasus and the labrum. This is remarkable in some Lamellicorn beetles, as Anoplognathus, Leach. (Gr. rhis, rhinos, the nose.)

Rhomboid, Rbomboidal. - Quadrilateral with the sides equal, but two opposite angles acute and two obtuse. Lozenge-shaped. (Gr. rhombos, from rhembo, to whirl round.) See Lozenged.

Rigid. - Hard, which does not bend or yield to pressure; stiff, not pliant; inflexible. (L. rigeo, to be stiff.)

Rimose, Rimous. - Chinky, resembling the bark of a tree. Having a number of minute, narrow, and nearly parallel excavations, which run into each other. (L. rimosus, from rima, a cleft.)

Rivose. - When furrows do not run in a parallel direction, and are rather sinuate; marked with sinuate furrows. (L. rivus, a stream.)

Rod (of the eye). - [See Rhabdom.]

Rorulent. - Like dew-drops. (L. ros, roris, dew.) See Pollinose, and Pulverulent.

Rorulent. - Covered with a bloom, like that of a plum, which may be rubbed off. (L. rorulentus, from ros, roris.)

Rosaceous. - (Scent.) A smell of roses. (L. rosa, a rose.)

Roseous, Roseus. - Rose colour. (L. rosa.)

Rostellum. - The oral instruments of Pediculus, and some other Aptera, in which the ordinary trophi are replaced by an exarticulate retractile tube, which controls a retractile siphuncle. It includes the tubulus, and siphunculus. (From L. rostrum, a beak, mouth.)

Rostral filaments. - The four hair-like processes which together form the sucking-tube or sucking mouth of the Coccidæ. (L. rostrum, and filum, a thread.)

Rostrate. - In the form of a rostrum. (L. rostrum.)

Rostrulum. - The oral instrument of Aphaniptera (Pulex L.), in which the ordinary trophi are replaced by a bivalve beak, between the valves of which there appear to be three lancets. It includes the laminæ, scalpella, and lingula. (L. rostrum.)

Rostrum. - Prolongation of the head between the eyes to a nose or beak. (L. a mouth.) See Proboscis.

Rostrum. - The upper part of the mouth of Coccidæ, from which spring the rostral filaments. (L.)

Rotative, Rotatory. - (Motion.) When capable of turning wholly round, describing a circle. (L. rota, a wheel.)

Rotundate. - When the margins pass gradually into each other, and do not meet in sharp angles. (L. rotundus, round.)

Ruber. - Clear unmixed red. (L. red.)

Rubescent. - Possessing a rose-coloured pubescence. (From L. rubeo, to be red.)

Rubineous. - (Splendour.) The red splendour of the ruby. (From L. ruber.)

Rubrican. - A bay or gray-black colour. (L. ruber, red.)

Rudimentary. - Undeveloped. (L. rudimentum.)

Rufescent. - Somewhat reddish. (L. rufus, red.)

Rufose, Rufous. - A brownish-red colour. (L. rufus.)

Rufus. - Coppery in colour. (L.)

Rugged. - When a surface shows a raggedness or roughness due to mucros, spines, and tubercles being intermixed. (M.E. rugged.)

Rugose, Rugous. - Wrinkled; full of wrinkles. (L. rugosus, full of wrinkles, adj. from ruga, a wrinkle.)

Rugosissimus. - Very uneven. (L.)

Rugulose. - Slightly wrinkled. (L. ruga.)

Rumules. - Teat-like fleshy protuberances observable on the bodies of various larvæ. (Kirby and Spence.) (L. ruma, a teat.)

Rursus. - (Direction). - Backwards. (L. rursus, backwards.) See Antrorsum.

Rypophagous. - Filth-eating. (Gr. rupos, filth, and phago, to eat.)


Original text Copyright © 1914 Nigel K. Jardine.
HTML mark-up and links Copyright © 2003 Peter Miller
This page was last changed 08-Sep-2003.
Up Top