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.

Fragile: easily breakable: thin and brittle.

Frass: 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 anal 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 Homoptera, 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 ante