@misc{indiciaefaff6f7167ea,
  title = {Butterflies; their structure, changes and life-histories, with special reference to American forms. Being an application of the "Doctrine of descent" to the study of butterflies. With an appendix of practical instructions — Illustration, Page 286},
  year = {1881},
  url = {https://www.biodiversitylibrary.org/page/19200421},
  note = {Source identifier: page-19200421}
}