Bug FAQChangeable Grass-veneer
Fissicrambus mutabilis · Order: Lepidoptera · Family: Crambidae
The changeable grass-veneer is a small moth with a wingspan of about 17 mm. It lives across eastern North America, from Quebec and Ontario down to Florida and west to Texas and Illinois. Its larvae eat a variety of grasses and partly grown caterpillars survive the winter, while adults fly from June through August in two generations each year.
Source: Wikipedia
Size
The adult’s wingspan measures roughly 17 mm.
Source: Wikipedia
Where it lives
It is found from Quebec down to Florida, and westward to Texas and Illinois.
Source: Wikipedia
What it eats
The caterpillars feed on many kinds of grasses.
Source: Wikipedia
Life cycle
Partially grown larvae can overwinter before completing development. Adults are on the wing from June to August, producing two generations each year.
Source: Wikipedia
When you see it
Adults are active during the summer months of June through August.
Source: Wikipedia
Where it comes from
Its range includes eastern Canada and the eastern United States.
Source: Wikipedia
Where it is found in the US
Recorded in 38 of 51 states and DC. Most records: Pennsylvania, Illinois, Maryland, Delaware, New York, New Jersey, Indiana, Virginia.
Darker = more records. Counts are museum and citizen-science records, not population size.
Source: GBIF
Status: native in North America; native in Canada; native in United States. Source: iNaturalist
Months it is reported in the US
Source: GBIF
More photos
Questions people ask
When can I see adult changeable grass-veneer moths?
Adults fly from June through August, usually in two summer generations.
Source: Wikipedia
What do the larvae of the changeable grass-veneer eat?
The caterpillars feed on a variety of grasses.
Source: Wikipedia
Where is the changeable grass-veneer found in North America?
It occurs from Quebec and Ontario down to Florida, and west to Texas and Illinois.
Source: Wikipedia
Same family (Crambidae)
Box Tree MothCydalima perspectalisDamages trees, gardens or crops
Celery Leaftier MothUdea rubigalisDamages trees, gardens or crops
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/Fissicrambus_mutabilis
Look it up elsewhere: GBIF · iNaturalist · BugGuide · Wikipedia
Text written 2026-10-23 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-23.