Dichotomous table for leafminers
1a corridor of 5 mm at most, followed by a circular excision of ca. 5 mm diameter: Incurvaria pectinea
1b blotch or tentiform mine => 2
1c galls, etc. => Tables for all parasites per species
2a snow-white, under-surface rounded tentifom mine, often containing several larvae or pupae: Macrosaccus robiniella
2b whitish upper-surface blotch, overlying the midrib, rather narrow with lobed extensions: Parectopa robiniella
Acacia was introduced in the middle of the 17th centrury from eastern North America (Weeda ao, 1987a) and, like in most exotics, its mining fauna is extremely poor; as late as in 2008 the first native miner was observed on it (I. pectinea). In the mean time from the southeast one succesfull species has invaded the Netherlands and a second one is approaching the borders.
Not included in the key: Liriomyza congesta.