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plural frontes
(anatomy) In vertebrates, especially mammals, the forehead; the part of the cranium between the orbits and the vertex. examples
(entomology) The front part of the epicranium or head capsule of many insects; generally speaking, the area below or between the antennae and above the clypeus. Typically it lies between the genal or "cheek" areas on either side of the head. quotations
In a generalized insect the frons extends from the vertex to the frontoclypeal (epistomal) suture, between the two anterior tentorial pits.
1981, J. F. McAlpine, Manual of Nearctic Diptera, volume 1, page 14
(entomology) (of Diptera) The postfrons. quotations
In most blondeliines (and in most Tachinidae in general), males have a narrower frons than conspecific females […]
1985, D. M. Wood, “A taxonomic conspectus of the Blondeliini of North and Central America and the West Indies (Diptera: Tachinidae)”, in Memoirs of the Entomological Society of Canada, volume 117, page 9