Flavous -us: sulphur yellow [gamboge].

Flavo-vixens: green verging upon yellow [apple green + chrome yellow].

Flex: to bend: to curve back.

Flexible: pliable; with elastic properties.

Flexile -is: capable of being bent at an angle without breaking: flexible.

Flexuous -ose: almost zig-zag, without acute angles but more acute at angles than undulating: differs from sinuate in being alternately bent and nearly straight.

Flexor: that which bends; applied to muscles.

Flocculus -i: a hairy or bristly appendage on the posterior c.o.xa of some Hymenoptera.

Floccus: a tuft of wool or wool-like hair.

Flosculiferous: species that bear a flosculus.

Flosculus: a small, tubular lunulate a.n.a.l organ with a central style, in certain Fulgorids.

Fluviatile: inhabiting the margins of running streams.

Fly-blows: eggs or young maggots of flesh flies: meat is fly-blown when such eggs or larvae have been deposited on it.

Flying-hairs: very long slender surface hairs set in punctures.

Foetid glands: glandular structures from which a foul smelling liquid may be ejected.

Foliaceous: leaf-like, or resembling a leaf.

Folioles: leaf-like processes from a margin or protuberance.

Follicle: = coc.o.o.n, q.v.: a cellular sac or tube, as of a gland or ovary.

Folliculate: enclosed in a case, coc.o.o.n or follicle.

Food reservoir: Lepidoptera, a blind sac or diverticulum from the bind part of oesophagus lying in abdomen dorsal to the stomach.

Foot: the tarsus, q.v.; improperly used to = leg; but in the plural form refers to legs rather than tarsi: see feet.

Foot-shield: in caterpillars, the chitinous plate on outer side of abdominal feet.

Foot-stalk: of the maxilla, is the stipes.

Foramen: an opening in the body wall for the pa.s.sage of a vessel or nerve: any opening at an apex: the opening of a coc.o.o.n.

Foramen magnum; the opening on the posterior surface of the head to give pa.s.sage to those structures that extend from head to thorax occipital foramen.

Foramina: small openings in the body wall: in Orthoptera, the auditory organs on the anterior tibiae.

Forceps: hook or pincer-like processes terminating the abdomen, like specialized appendages of ear-wigs: similar processes in the male, used as clasping organs in copulation.

Forc.i.p.ate: bearing forceps or similar structures.

Forcipiform: having the form of forceps or pincers.

Fore: anterior.

Foregut: extends from the mouth to the end of gizzard; its epithelium being formed from the ectodermal inv.a.g.i.n.ation known as the stomodaeum.

Forehead: in Mallophaga, the head in front of the mandibles and antennae.

Fore-intestine: =foregut, q.v.

Forficate: = forc.i.p.ate, q.v.

Forks: Trichoptera; forks of veins in apical part of wing, numbered 1, 2, 3, etc.

Form: applied to representatives of a species which differ from the normal or type, in some uniform character; it is seasonal if it occurs at a period different from the type; dimorphic if there is an alternation of generations or two color patterns occur; or s.e.xual if the members of one s.e.x differ uniformly from those of the other.

Formic: of, pertaining to or derived from ants.

Formicary: an ant's nest or ant-hill.

Fornicate: arched or vaulted: concave within, convex without.

Fossa -ae: = fossula; q.v.

Fossoria: burrowers: in Orthoptera, the mole crickets and allies; in Hymenoptera, the digging wasps.

Fossorial: formed for or with the habit of digging or burrowing.

Fossula -ae: a deep groove or sinus with sharp edges: specifically applied to grooves on the head or sides of prothorax in which the antennae are concealed.

Fossulate: a surface with oblong impressions.

Fossulet: an elongated, shallow groove.

Fourth longitudinal vein: Diptera (Will.), = media 2 (Comst.).

Fovea, Foveola -ae: a shallow depression with well-marked sides: a pit.

Foveate: with foveae or pit-like depressions.

Foveolate: with shallow cavities like a honey-comb.

Fractus: broken: also applied to a geniculate antenna.