Fertilization: takes place when a spermatozooen enters through the micropyle of an ovum and unites with the cell nucleus: loosely applied like copulation or to its completion. Festivus: variegated with bright colors. Festooned: arranged in loops as if hung from nails. Fibre: a thread-like structure of any tissue. Fibrilla: rod or sliver-like nerve elements, often grouped like a bundle of short threads. Fibrin: a proteid compound making up a large part of the muscular tissue: also found in blood and other body liquids. Fibrinogen: a proteid substance of the blood and other body fluids, concerned in the production of fibrin. Fibroin: a chemical compound found in silk, cobwebs and the like. Fifth longitudinal vein: Diptera (Will.); = media 3 (Comst.). Filament: a thread: a long slender process of equal diameter throughout: an elongated appendage. Filariasis: a disease caused by the presence of minute worms or Filaria, transmitted by mosquitoes. {Scanner's comment: Nowadays it is known that many kinds of filariasis are transmitted by other species of flies, in particular Simuliidae and Tabanidae} Filate: Diptera; antennae that are simple, without lateral hair or dilation: thread-like. Filator: the silk spinning structure of caterpillars. File: the diagonal ridged vein near the base of the tegmina in crickets, used in stridulating: in general any structure wherever situated that serves the same purpose. Filicornia: insects with thread-like antennae; e.g. in Coleopteran, the Carabidae. Filiform: thread-like: slender and of equal diameter. Filippi's glands: a pair of secondary glands, opening into the silk glands of caterpillars near their anterior end. Fillet: a transverse, raised structure between the antennae in Lepidoptera. Filose: ending in a thread-like process. Fimbria: thick, ciliated hair at the termination of any part: fringes. Fimbriate: a margin or process when set with a fringe of hair closely placed. Finger: of maxilla, is the digitus, q.v. First clypeus: see post clypeus. First inner apical nervure: in Hymenoptera (Nort.); is cubitus 1, from media 4, to first anal (Comst.). First lateral suture: Odonata; starts from beneath base of front wing behind humeral suture and meets it behind second coxa. First longitudinal vein: in Diptera; - radius 1 (Comst.). First submarginal cross-nervure: Hymenoptera; part of the media and the radio-medial cross vein (Comst.). Fissate: divided or split: with fissures or cracks. Fissile -is: cleft or divided; as the wings in plume-moths: also used for lamellate. Fissiparous: applied to that form of asexual generation in which the parent divides; each part becoming a new individual. Fissure: a crevice: a narrow longitudinal opening: a slit. Fissus: cleft: longitudinally divided nearly to base. Fistula: a slender tube: specifically applied to the channel formed by the union of the two parts of proboscis in Lepidoptera. Fistular: like a slender, cylindrical tube.