Genus Trichacis Förster, 1856

Figs 22–23

Trichacis Förster, 1856: 108, 115. Type species Trichacis pisis (Walker, 1835) by subsequent designation by Ashmead 1893: 294.

Trichasis Förster, 1856 – Thomson 1859: 78. — Vlug 1995: 84 (misspelling).

Remarks

Trichacis is characterized by a tuft of setae on the mesoscutellum and a round or ovoid head (as opposed to the blocky head of Isocybus). Species of Trichacis typically have a smooth or finely sculptured frons with transverse striation or rugulae above the toruli. Upon its description, Förster included T. didas (Walker, 1835), T. pisis (Walker, 1835), and T. remulus (Walker, 1835) . Trichacis pisis was designated as the type species by Ashmead (1983). The NHMW includes one female original exemplar of T. tristis, a species for which there is no known type material. We here designate this specimen (NHMW-HYM#0005319) as the neotype of Platygaster tristis Nees, 1834 .