The larvae of the 4 regularly observed Amorpha-feeding Catocala are all comparable but can be separated from other species in North America by: their pattern consists of white, yellowish and brownish to black stripes both dorsally and laterally (often garishly so), a stripy head capsule face with no dark band above the vertex, no A5 saddle patch, no A5/A8 protuberances, no lateral filaments, and a venter with well-defined borders outlining the lighter mid-ventral area which itself sports prominent darker stippling. The life history of the fifth species, the presumed Floridian endemic slotteni, remains unknown. Larvae of abbreviatella and whitneyi both are typically found in prairie-like habitats where Amorpha canescens grows, and are the closest morphologically, with abbreviatella more brownish and with the body striping more continuous than the dot-like striping of whitneyi. Larvae of amestris and nuptialis are found in a variety of habitats where their preferred foodplant Amorpha fruticosa grows, notably along waterways.