Diathrausta harlequinalis, the harlequin webworm moth, is a moth in the family Crambidae. It was described by Harrison Gray Dyar Jr. in 1913. It is found in North America in Mexico, Arizona, California, Colorado, Connecticut, Florida, Maryland, Massachusetts, Minnesota, New Mexico, North Carolina, Oklahoma, Ontario, Quebec, South Carolina, Tennessee and Texas.
The wingspan is 13 mm. Adults have been recorded from March to October.Moth Photographers Group at Mississippi State University
Subspecies Diathrausta harlequinalis harlequinalis Diathrausta harlequinalis amaura Munroe, 1956 Diathrausta harlequinalis lauta Munroe, 1956 Diathrausta harlequinalis montana Haimbach, 1915
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