Discovered on the same ragweed plant I'd collected a dark-colored Red Admiral caterpillar from. I went to gather more leaves, noticed another leaf shelter, and couldn't resist taking this beauty home.

It remained red and yellow, with light-colored spines, as a caterpillar and prepupa. The pupa was also slightly paler than that of the dark-colored caterpillar.

Compare to its darker-colored relative, photographed at the same time:


Plant: Ragweed (Artemisia sp.)