1. Department of Animal Biology, University of Illinois, Urbana-Champaign, IL 61801, USA.
2. Neuroscience Program, Program in Ecology, Evolutionary Biology and Conservation, Institute for Genomic Biology, University of Illinois, Urbana-Champaign, IL 61801, USA.
3. Department of Entomology, University of Illinois, Urbana-Champaign, IL 61801, USA.