Gall (Figs 14-16). Usually elongated, sometime potato-like, abrupt, irregular swellings of twigs and branches, 3-16 cm long and 3-5 cm in diameter. The gall surface rough, of the same colour as the bark; lignified. Multichambered, larval cells long tubular-like, radiating from the centre of the gall. Tubular larval cells are isolated; up to 78 larval chambers in one gall.

Biology. Only asexual females are known, inducing galls on Quercus costaricensis Liebm. (Section Lobatae of Quercus, red oaks), distributed only in Costa Rica (Govaerts & Frodin, 1998). Mature galls were collected in December-February, adults emerged immediately after the galls were collected. Probably galls mature in late autumn, adults overwintering in the gall and emerging in late winter next year

Distribution. Currently known from Costa Rica, Cerro de la Muerte only.