Abstract
Feeding and non‐feeding stages within each of the first 3 larval instars of the jarrah leafminer, Perthida glyphopa, are described and figured. The mean length of larval development in mines at a coastal site near Perth was 82.8 days, during which larvae of instars 2 and 3 remained in the non‐feeding stage for 4–6 and 4–7 days respectively.