Diglyphus isaea
they develop, the larvae consume the leafminer from within, leading to its death. This feeding behavior is highly effective in reducing leafminer populations [...] instars: the first is colourless and transparent, the second is yellow and semi transparent with a brown fat body, and the third larval instar is blue-green. [...] pillars, made by the larva from its faeces. This is probably done to prevent the leaf collapsing should it dry out. At first, the pupa is green with red eyes