Acknowledgements

This work was supported by Carl Tryggers Stiftelse för Vetenskaplig Forskning, Formas (project 2011-1370) and the Linnaeus environment “Insect Chemical Ecology, Ethology, and Evolution (IC-E3)” (Formas, SLU). The authors acknowledge support from Science for Life Laboratory, the National Genomics Infrastructure (NGI), and Uppmax for providing assistance in massive parallel sequencing and computational infrastructure. Two reviewers provided constructive and valiable comments.