In mid-May 2014, Dr. Nathalie Nagalingum (Royal Botanical Garden Sydney) and I sampled along an altitudinal transect in the Blue Mountains for flies and bracken fern (Mt. Tomah and Mt. Victoria), and then yesterday we traveled to mid-Queensland to obtain more samples of flies and ferns for population genomics studies. In bracken in the north, hydrogen cyanide production is lower than in the south, and so we are interested in the reciprocal evolutionary response in the flies from a detoxification perspective. Allele frequencies at every locus will be estimated for the flies in the north and south and along the elevational gradient to identify regions of the genome that are being shaped by Darwinian evolution in the context of this arms race between the ferns and flies. We are on a shoestring budget, but we are delighted to be sampling in the fabulous subtropical bush of Australia.