Staphylea bladder-nut
Dichotomous table for leafminers
1a fleck mine: Coleophora violacea
1b contorted corridor, starting at a black, shining, globular egg shell, and ending in a blotch: Ectoedemia atricollis
1c galls, etc => Tables for all parasites per species
The occurrence of Caloptilia fribergensis and Phyllonorycter oxyacanthae on bladder-nut is improbable.