subcallus

plural subcalli

1. biologyThe lowest of the calli on the frons of some species of horse flies.

   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.

   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