Synonyms and other taxonomic changes
Elophila gyralis (Hulst, 1886)
Munroessa gyralis (Hulst, 1886)
Hydrocampa gyralis Hulst, 1886
Nymphula dentilinea Hampson, 1897
Wingspan 16-30 mm; female larger than male
Adult: sexually dimorphic - female usually unmarked orangish-yellow to dark brown; male forewing orangish-brown to dark grayish-brown; lines of male black with white edging; AM and PM lines connected at upper and lower third to form loops from costa and inner margin; terminal line white, composed of a series of inward-projecting wedges; hindwing whitish to gray. (1)
Heppner (2003) reported the range to include Quebec to Florida,, Manitoba to Texas. (2)
Larvae are aquatic; adults may be flushed from nearby vegetation during the day but are nocturnal and attracted to light.
The main flight period is April to October.
Heppner (2003) reported January to December in Florida. (2)
Larvae feed on leaves and bore into petioles of waterlilies.
Hulst, G.D., 1886. Descriptions of new Pyralidae. Transactions of the American Entomological Society
, 13: 159
live adult images
showing variation in color between males and females, plus description, foodplants, flight season (Lynn Scott, Ontario)