Parapoynx maculalis, the polymorphic pondweed moth, is a moth in the family Crambidae. It was described by James Brackenridge Clemens in 1860. It is found in eastern North America, where it has been recorded from Alabama, Alberta, Florida, Georgia, Illinois, Indiana, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, New Brunswick, New Hampshire, New Jersey, Newfoundland, North Carolina, North Dakota, Nova Scotia, Ontario, Pennsylvania, Quebec, South Carolina, Tennessee, Texas and Wisconsin.Moth Photographers Group. Mississippi State University. The habitat consists of ponds and streams.
The wingspan is 18–22 mm. The forewings are white, dusted with fuscous along the base and with a fuscous spot at the base of the fold. The hindwings are pure white.Clemens, B. 1860. "Contributions to the study of Lepidopterology - No. 5". Proceedings of the Academy of Natural Sciences of Philadelphia 12: 218-219.
The larvae feed on various aquatic plants.Bug Guide Young larvae are light yellowish brown with a dark yellowish-brown head.Welch, P.S. 1916. "Contribution to the biology of certain aquatic Lepidoptera". Annals of the Entomological Society of America 9(2): 160-181, pl.7-9, f.1-19]
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