4 species in 3 genera are known from Block Island. Regionally, this family of minute moths includes only leafminers of Fagaceae, Rosaceae, and Asteraceae. The near-absence of oaks on Block Island limits the potential diversity of this group on the island. The species documented on Block Island are miners of oak (Quercus spp.) and chestnut (Castanea spp.), chestnut (Castanea spp.), blackberry (Rubus spp.), and asters (Asteraceae), respectively.