Part 59

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 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 space 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.