A new paper identifying loci for assortative mating in Heliconius melpomene and Heliconius cydno, Genetic dissection of assortative mating, was published in PLoS Biology by Merrill et al. today. Check it out here , as well as my primer for their paper, Searching for the genes driving assortative mating. Many thanks to graduate student Matt Murphy for his artwork, which is featured in the primer!