Feron syndicorum Pujade-Villar & Cuesta-Porta, sp. nov.

Gall (Fig. 394). Yellow crystalline leaf gall mass (aggregation of galls, 5-20 galls) on underside of leaf, to 20 mm long projecting from leaf by up to 15 mm. Larval chambers easily detachable from leaf and crystalline pubescence extremely brittle.

Biology. Only the asexual generation is known, which induces galls on Q. potosina (section Quercus, subsection Leucomexicana). The gall matures in late autumn and the adults emerge soon after.

Distribution. Mexico, La Cumbre (Monte Escobedo, State of Zacatecas).