Farctus: fully filled.
Farinaceous: mealy: applied to powdery looking wings and surfaces.
Farinose: dotted with many single, flour-like spots: mealy.
Fascia: a transverse band or broad line; it is common when it crosses both wings or wing covers.
Fasciate: banded transversely.
Fascicle -ulus: a bundle of hair, threads or fibres.
Fasciculate: bundled; clustered as in a bundle; tufted: a surface when covered with bundles of long hair.
Fastigiate: flat-topped and of equal height: also applied to elytra that extend a little beyond the abdomen.
Fastigium: Orthoptera; the extreme point or front of vertex.
Fat-body: is the mass of oil or fat cells found, especially in larvae, surrounding the alimentary canal and some other internal organs.