F 1 First filial generation, arising from a cross, subsequent generations abbreviated F 2 , F 3 , etc. see P 1 .

face n. [L. facies, countenance] 1. The surface of anything. 2. (ARTHRO: Insecta) The front of a verticle head between the compound eye above the mouth to vertex. a. In Hymen-optera between antennae and clypeus. b. In Diptera, below the frontal suture, often having grooves or fovea below the antennae; the mesofacial plate. c. In Ephemeroptera, the fused front and vertex; facies.

facet n. [F. facette, small face] 1. A small surface. 2. (ARTHRO: Insecta) The external surface or part of a compound eye unit or ommatidium.

facette n. [F. facette, small face] (ARTHRO: Pentastomida) A funnel-shaped opening through the inner membrane complex of the egg into which the product of the dorsal organ is deposited.

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