Speyeria idalia

Speyeria idalia, the “Regal Fritillary”, is an example of a butterfly species that was not uncommon in the vicinity of Philadelphia during the mid-19th Century, possibly due to human activity such as agricultural practices that may have inadvertently maintained suitable grassland habitats. This butterfly has declined rapidly in recent years and no longer occurs in the Delaware Valley, although eastern populations still occur elsewhere in Pennsylvania and Virginia.