subcallus

English

Etymology

sub- +‎ callus

Noun

subcallus (plural subcalli)

1. (entomology) The lowest of the calli on the frons of some species of horse flies.
   • 1985, Richard C. Wilkerson, “A new species of Stenotabanus (Brachytabanus) (Diptera: Tabanidae) with a key to the species of the subgenus”, in Proceedings of the Entomological Society of Washington, volume 87, number 1, page 223:

     It is interesting to note that the presumed male of this species does not have shiny anterior tentorial pits but does have a pair of dark brown spots on the subcallus, these lacking in the female.