A new melanistic variant of the caterpillar hunter Calosoma wilcoxi LeConte, 1848 from Texas, United States of America and a preliminary phylogeny of the genus Calosoma Weber, 1801 (Coleoptera: Carabidae) Ray, J.W. Seidel, M. Husemann, Martin 2017 - Forschungsinformationssystem der UHH