Fragile: easily breakable: thin and brittle.
Fra.s.s: the excrement; usually the excreted pellets of caterpillars.
Free: unrestricted in movement: not firmly joined with or united to any other part: said of pupae when all the parts and appendages are separately encased as in Coleopteran.
Frenatae: that series of Lepidoptera in which a more or less well-marked frenulum occurs.
Frenate: having a frenulum.
Frenulum: the spine, simple in males, compound in females, arising from the base of secondaries in many Lepidoptera, whose function it is to unite the wings in flight: in Cicada the triangular lateral piece on the mesonotum which connects with the trochlea: the a.n.a.l area of secondaries and thus = tendo, q.v.
Frenulum hook: in the males of frenate Lepidoptera, a hook or fold into which the frenulum is fitted.
Frenum: that which holds things together: a lunate or triangular portion at the inner and hinder base of the wing in Odonata and Trichoptera; see tendo.
Fringe -es: an edging of hair, scales or other processes extending well beyond the margin and usually of even length: in Lepidoptera, fringes occur on the outer margins of all wings and consist of scales or hair projecting beyond the wing membrane.
Frog: the articular pan, - q.v.
Frons: = front; q.v.
Front: the anterior portion of head between base of antennae and below ocelli: in h.o.m.optera, the vertical median area of face.
Frontal: referring to the front of head or anterior aspect of any part.
Frontal costa: Orthoptera, a prominent vertical ridge of bead which may be median or lateral: see median carina and lateral carina.
Frontal fastigium: in Orthoptera, that process of the face extending dorsad between the antennae and meeting or nearly meeting the fastigium of the vertex in Tettigidae.
Frontal fissure: Diptera; the impressed line extending from the frontal lunule to the border of the mouth.
Frontal lobes: in Psyllidae, two lobes or swellings more or less completely divided by a suture in which an ocellus is situated.
Frontal lunule: Diptera; an oval or crescentic s.p.a.ce above the base of antennae in Cyclorrhapha, bounded by the frontal suture.
Frontal processes: Diptera; = antennal process, q.v.
Frontal ridge: in Coleopteran; a sharp ridge on the dorsal margin of the eye, extending forward.
Frontal stripe: Diptera; the middle of the front when membranous or discolored: = vitta frontalis.
Frontal suture: Diptera; separates the frontal lunule from that part of the head above it: in Coleopteran; = clypeal suture.
Frontal tubercles: in certain Aphids, are raised structures upon which the antennae are placed.
Frontal triangle: Diptera; the triangular s.p.a.ce in males, between the eyes below, limited by a line drawn through base of antennae.
Frontal vesicle: in Odonata; that elevated area on the vertex upon which the ocelli are situated.
Fronto-orbital bristles: in Diptera; are placed on each side of the front, just below the vertical bristles.
Fugitive: soon disappearing; not permanent.
Fulcrant: the trochanter when continued along the femur, as in Carabids.
Fulcrum: the chitinous envelope at the base of mouth in Diptera and Hymenoptera, covering the beginning of the oesophagus: any structure that serves as a support to another..
Fulgidus: shining.
Fuliginous -osus: sooty or smoky brown [Van d.y.k.e brown + a little black].
Fulvo-aeneous: brazen, with a touch of brownish yellow [brown pink].
Fulvous -us: tawny; light brown with much yellow; nearly orange [pale cadmium yellow + Indian red].
Fumate -us: smoky gray [gray].
Fumose: smoky.
Function: the work or duty which a given part or organ normally performs.
Fungicolous: living in or on fungi.
Funicle: the joints between the scape and club in Funiculate antennae: a small cord: a slender stalk.
Funiculate: whip-like: long, slender, composed of many flexible joints.
Funicule: a small, cord-like structure; especially when sheathed.
Funiculus: the main tendon of abdomen: in Hymenoptera a slender ligament connecting the propodeum to petiole on its dorsal aspect.
Furca: a fork: the a.n.a.l appendage used for leaping in Thysanura; see furcula: the forked ental processes of the sternum.
Furcal orifice: see sternal into orifice.
Furcate: forked; divided nto two approximately equal divisions.
Furcula: a forked process: an osmaterium {Scanner's comment: sic. See comment under "osmaterium".}: in Collembola the spring or saltatory appendage borne by the fourth abdominal segment: in Orthoptera, a pair of backwardly directed appendages which overlie in a more or less forked position the base of the supra-a.n.a.l plate.
Furred: covered with dense hair resembling fur.
Fuscescent: becoming brown; with a brown shading.
Fusco-ferruginous: brownish rust red.
Fuseo-piceous: pitch black with a brown tinge or admixture.