@misc{Opitz2013,
  author    = {Weston Opitz},
  title     = {Balcus violaceus (Fabricius) : senior synonym of Balcus niger Sharp and B. signatus Broun (Coleoptera: Cleridae: Clerinae)},
  booktitle = {Insecta mundi : a journal of world insect systematics},
  series    = {Insecta Mundi},
  number    = {0284},
  type      = {periodicalpart},
  pages     = {2},
  year        = {2013},
}