Both gracilis and sordida sport similar larvae and can be regularly found on blueberries, although usually not as often as the related andromedae which tends to be far less brown and with more pervasive striping and stippling throughout. Larvae of gracilis have many medium-lengthed lateral filaments, and usually have rather pronounced spots on the head capsule face below the vertex; in larvae of sordida the filaments are either essentially absent or are reduced in number and length (but a minority of individuals overlap gracilis), and the head capsule face is usually not spotted. Various species of Vaccinium are the typical foodplants for both gracilis and sordida (Eubotrys and Leucothoe recorded for gracilis rarely). In western and southern Connecticut, all our larval records for gracilis are from Highbush Blueberry Vaccininum corymbosum, whereas all larval records for sordida are from Lowbush Blueberries Vaccinium angustifolium and Vaccinium pallidum (sordida females have been observed ovipositing in the field on Vaccinium pallidum). Both gracilis and louiseae are present and overlap in Florida, but the larva of the latter is like andromedae; the larva of the related bastropi is unknown.