Explanation of Terms Used in Entomology Part 30

Exuvia -iae -ium: the cast skin of a larval insect: in Diaspinae the larval skin when cast and incorporated in the scale.

Exuviate: to cast the skin: to moult.

Exuviation: the act of molting: the cast-off skin or exuvium.

Eyes: the organs of sight, composed of numerous facets, situated, one on each side of the head: the term is properly applied to compound eyes only but is sometimes used to designate also the simple eyes or ocelli.

F

Face or Facies: the upper or outer surface of any part or appendage: the front of the head between the compound eyes above the mouth to the vertex; usually applied to insects in which the head is -vertical: in bees extends between the eyes to the base of the antennae; in the Hymenoptera generally the area between antenne and clypeus: in flies the area between base of antennae, the oral margin, eyes and cheeks.

Facet: a small face or surface: one of the parts, areas or lens-like divisions of the compound eye.

Facial angle: the angle formed by the junction of the face and vertex.

Facial bristles: Diptera; a series on either side of the middle portion of the face, above the vibrissae, along the facialia.

Facial carinae: applied to both the carinae of the frontal costa and the accessory (lateral) carinae of the face; but usually restricted to the accessory carinae in Orthoptera.

Facial depression: = antennal fovea, q.v.

Facialium -ia: Diptera; that portion of the face between the lower part of the frontal fissure and the antennal fovea.

Facial quadrangle: in bees; the quadrangle bounded laterally by the eyes, above by a line between their summits and below by a similar line between their lowest points.

Facial ridges: Diptera; the elevated lateral borders of antennal grooves.

Facial tubercle: Diptera; a median convexity below middle of face.

Facies: the face: the general appearance or impression.

Falcate: sickle-shaped; convexly curved: a wing when deeply excavated below the apex so as to leave the latter acute and a little curved.

Falciform: curved like a sickle.

False legs: = spurious legs; = prolegs; q.v.

Family: a division of cla.s.sification including a number of genera agreeing in one or a set of characters and so closely related that they are apparently descended from one stem: opinionative and indicated by the termination idae.

Farctus: fully filled.

Farinaceous: mealy: applied to powdery looking wings and surfaces.

Farinose: dotted with many single, flour-like spots: mealy.

Fascia: a transverse band or broad line; it is common when it crosses both wings or wing covers.

Fasciate: banded transversely.

Fascicle -ulus: a bundle of hair, threads or fibres.

Fasciculate: bundled; cl.u.s.tered as in a bundle; tufted: a surface when covered with bundles of long hair.

Fastigiate: flat-topped and of equal height: also applied to elytra that extend a little beyond the abdomen.

Fastigium: Orthoptera; the extreme point or front of vertex.

Fat-body: is the ma.s.s of oil or fat cells found, especially in larvae, surrounding the alimentary ca.n.a.l and some other internal organs.

Fatiscent: with cracks, crevices or openings.

Fauna: the a.s.semblage of animals inhabiting a region or country.

Favose: with large deep holes, like the cells of a honeycomb.

Favus: a cell like that of a honeycomb.

Fecula: the excrement of insects.

Fecundation: the making fertile; as an egg by a spermatozoon.

Feeler: commonly applied to antennae; q.v.

Feelers: tactile organs: the term is usually applied to the antennae, but sometimes to the palpi, as mouth-feelers.

Feet: the legs or organs of locomotion; one pair attached to each thoracic segment; composed of c.o.xa, trochanter, femur, tibia and tarsus only; plural of foot; q.v.

Female: designated by "O+" the astronomical sign for Venus: that s.e.x in which the ova are developed. {Scanner's comment: The sign for Venus being an orthogonal cross or plus sign hanging vertically below a circle.}

Femina: the female, or belonging to that s.e.x.

Femorate -us: with abnormal or unusually developed femora or thighs.

Femoro-tibial: pertaining to both femur and tibia or to the articulation between them.

Femur -ora: the thigh: usually the stoutest segment of the leg, articulated to the body through trochanter and c.o.xa and bearing the tibia at its distal end: in Coccidae and quite commonly, the femur and trochanter are considered as one, for measuring purposes.

Fenestra: a window; a transparent gla.s.sy spot or mark; a pellucid mark in a vein: a small, pale, membranous area at the base of the antenna in roaches.

Fenestrate: with transparent or window-like naked spots as in the wings of some Lepidoptera.

Fenestrate membrane: of the compound eye is at the base of the ommatidia, at their junction with the optic nerve; see retina.

Ferreous -eus: the metallic gray of polished iron.