Keywords: Butterflies BHL19200155.jpg 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 19200155 63318 22651 Table of Contents http //www biodiversitylibrary org/page/19200155 10 5962/bhl title 22651 Scudder Samuel H NOT_IN_COPYRIGHT<br> Biodiversity Heritage Library Check categories 2015 October 31 PD-old-70-1923 Butterflies Their Structure Changes and Life Histories Images uploaded by Fæ Files from the Biodiversity Heritage Library |