Bug FAQHarlequin Webworm Moth
Diathrausta harlequinalis · Order: Lepidoptera · Family: Crambidae
The harlequin webworm moth has a wingspan of about 13 mm. Adults are seen from early spring through fall, roughly March to October. It occurs across many parts of North America, including many U.S. states and Canadian provinces such as Ontario and Quebec.
Source: Wikipedia
How to recognize it
Diathrausta harlequinalis, called the harlequin webworm moth, belongs to the Crambidae family.
Source: Wikipedia
Size
The moth’s wingspan measures about 13 mm.
Source: Wikipedia
Where it lives
It is found in many North American locations, including Mexico, several U.S. states such as Arizona, California, and Florida, and Canadian provinces like Ontario and Quebec.
Source: Wikipedia
When you see it
Adults have been recorded from March through October.
Source: Wikipedia
Where it comes from
Its range covers parts of North America, spanning Mexico, numerous U.S. states, and Canadian provinces.
Source: Wikipedia
Where it is found in the US
Recorded in 28 of 51 states and DC. Most records: Texas, Arizona, Colorado, New Mexico, Oklahoma, Alabama, Florida, Georgia.
Darker = more records. Counts are museum and citizen-science records, not population size.
Source: GBIF
Status: native in North America; native in Canada. Source: iNaturalist
Months it is reported in the US
Source: GBIF
More photos
Questions people ask
Where can I find harlequin webworm moths?
They occur in many parts of North America, including states like Arizona, California, Florida, and provinces such as Ontario and Quebec.
Source: Wikipedia
Same family (Crambidae)
Box Tree MothCydalima perspectalisDamages trees, gardens or crops
Celery Leaftier MothUdea rubigalis
Elegant Grass-veneerMicrocrambus elegans
Hawaiian Beet Webworm MothSpoladea recurvalisDamages trees, gardens or crops
Garden Grass-veneerChrysoteuchia culmellaDamages trees, gardens or crops
Bluegrass Webworm MothParapediasia teterrellusDamages trees, gardens or cropsSources
- Wikipedia: https://en.wikipedia.org/wiki/Diathrausta_harlequinalis
Look it up elsewhere: GBIF · iNaturalist · BugGuide · Wikipedia
Text written 2026-10-25 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-25.