Erratum to: J Mol Evol (2012) 75:141–150 DOI 10.1007/s00239-012-9528-x

Our original paper neglected to acknowledge that Steve Schaeffer and Andre Wallace genotyped and provided the Pikes Peak lines of Drosophila pseudoobscura for sequencing. We thank them for this contribution and apologies for neglecting to mention it directly.