Gall (Fig. 5C–G). Irregular small formations (up to 4–9 mm) arising from crevices on the stems and on the petiole and midribs of leaves. The gall is displayed as a dense mass covered with light brown hairs, solitary, containing a single larval cell or more frequently forming clusters, and then appearing as polythalamous. Inside, the gall has a highly lignified core enclosing the larva (Fig. 5E).

Host plant. Quercus bumelioides Liebm. (section Quercus of Quercus; white oaks (Fagaceae), a species distributed from Mexico to Panama (Breedlove 2001). The gall resembles that of the species of the Nubila complex, established by Kinsey within the subgenus Acraspis of Cynips (Kinsey 1936), all known from Mexico. These galls were described as a mass of coarse hairs containing a spherical hard core, attached to mid-veins, on or under the surfaces of leaves.

Distribution. Barucynips panamensis was found between 2515–3045 m a.s.l. at Volcán Barú, Chiriqui, Panama. Although currently known only at this locality, it is a species that is relatively abundant at the higher elevations of Volcán Barú.