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 classification 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.