On 31 July 1994, at 1600 hr, an aggregation of eight larvae of Chlosyne gorgone (Hubner) was found at Bush Clover Prairie, in Grant Co., Wisconsin. The larvae were feeding on the upper surface of a leaf of Echinacea pallida (Asteraceae), eating away the top tissue and leaving the translucent lower epidermis in place in an area about 1 cm wide and 4 cm long, oriented length- wise along the lanceolate leaf.
Williams, Andrew H.
"New Larval Host Plant and Behavior of Chlosyne Gorgone (Lepidoptera: Nymphalidae),"
The Great Lakes Entomologist, vol 28
Available at: https://scholar.valpo.edu/tgle/vol28/iss1/7