External area: Hymenoptera; the upper of the three cells or areas of the metanotum, between the median and lateral longitudinal carina, first lateral basal area. External median area: Hymenoptera; the median of the three cells or areas between the median and lateral longitudinal carinae: = second lateral area. Externomedial vein: in Hymenoptera (Norton) = radius (Comst.); in Orthoptera, = media (Comst.). Externo-median nerve: the humeral and discoidal veins together. Extra-ocular: remote from or beyond the eyes. Extremity: the point most remote from base. Extrorse -um: toward the outside. Extrude: to turn or force out. Exude: to ooze or flow slowly through minute openings. 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.