he optic nerve; see retina.

Ferreous -eus: the metallic gray of polished iron.

Ferrugineous -ous, -eus, -osus: rusty red-brown [Dragon's blood, but
brighter].

Ferrugino-testaeeous: a rusty yellow brown: a mixture of rusty red
with dull yellow brown.

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: Odonat