Gall. (Figs 11–12). A spherical, slightly ovate stem gall, easily detachable when mature, about 10 mm in diameter; outer surface smooth, shiny, red; with one central larval chamber. Young galls are slightly flattened laterally, yellowish green in colour, and often found in rows along the branch, emerging from an elongated scar in the bark. Mature galls become easily detachable and fall to the leaf litter, where they resemble red coffee fruits before they fall. Adult wasps normally emerge from the galls on the ground.

Host plant. Quercus bumelioides Liebm. (Section Quercus of Quercus; white oaks), distributed from Mexico to Panama (Govaerts and Frodin 1998).

Distribution. Currently known only from Costa Rica. Very common species in the Talamanca mountain range of Costa Rica (P. Hanson, personal observation).