▁adult s ▁feed ▁on ▁thin ▁young ▁branches ▁of ▁el ms , ▁che w ▁the ▁thin ▁b ark ▁and ▁part ▁of ▁the ▁sap wood , ▁thus ▁making ▁gro ov es ▁that ▁run ▁along ▁or ▁around ▁these ▁branches . ▁There ▁is ▁usually ▁a ▁single ▁generation ▁per ▁year . ▁Sometimes ▁there ▁is ▁a ▁second ▁generation , ▁which ▁f lies ▁in ▁July – August , ▁and ▁lay ▁eggs ▁in ▁mid – August . ▁Their ▁lar va e ▁develop ▁in ▁September , ▁and ▁reach ▁near ▁full ▁lar val ▁m atur ity ▁prior ▁to ▁the ▁winter . ▁Lar va e ▁over w inter . ▁Several ▁species ▁of ▁Chal cido idea ▁par as ito ids ▁use ▁S . ▁j ac ob son i ▁lar va e ▁as ▁their ▁host . ▁ ▁Distribution ▁ ▁This ▁species ▁has ▁been ▁reported ▁from ▁sout he astern ▁Russia ▁( Prim or sky ▁K rai ▁province ▁and ▁Sak hal in ▁island ), ▁n ort he astern ▁China ▁( He il ong ji ang ▁and ▁L ia oning ▁provinces ), ▁and ▁Japan . ▁The ▁only ▁North ▁American ▁report ▁is ▁with ▁a ▁single ▁S . ▁j ac ob son i ▁spec imen ▁caught ▁in ▁the ▁wild ▁in ▁ 2 0 0 9 ▁in ▁the ▁Vern on ▁land fill ▁in ▁southern ▁British ▁Columbia , ▁Canada , ▁with ▁a ▁Lind gren ▁fun nel ▁trap ▁( multiple ▁black ▁fun n els ▁aligned ▁vert ically ▁to ▁m im ic ▁a ▁tree ▁tr unk , ▁with ▁a ▁collection ▁v ial ▁at ▁the ▁base , ▁to ▁collect ▁insect s ▁associated ▁with ▁trees ) ▁b