Part 126

Rete: the fatty mass of insects: also applied generally to any structureless membrane or layer.

Reticulate: like net-work.

Reticulum: a net-work; as of a cell.

Retina: that portion of the eye upon which the image is formed.

Retinaculum: in Lepidoptera, the loop into which the frenulum of the male is fitted; = hamus, q.v.: in Hymenoptera, horny, movable scales serving to move the sting or to prevent its being darted out too far: in Coleoptera, the middle, tooth-like process of the larval mandible.

Retinal pigment: the pigment layer of the compound eye just above the basilar or fenestrate membrane.

Retinophora: = retinula; q.v.

Retinula -ae: the retina of a single ocellus: the nerve fibres or cells between pigment cells and retina of the compound eye.

Retracted: drawn back; opposed to prominent.

Retractile: capable of being drawn in or retracted.

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 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.