Mantispa styriaca
... that the larva of Mantispa styriaca spins a cocoon inside a spider's egg sac?
... that the larva of <i id="mwAYE"><b id="mwAYI"><a href="./Mantispa_styriaca" id="mwAYM" rel="mw:WikiLink" title="Mantispa styriaca">Mantispa styriaca</a></b></i> spins a cocoon inside a spider's <a href="./Spider#Reproduction_and_life_cycle" id="mwAYQ" rel="mw:WikiLink" title="Spider">egg sac</a>?