Bug FAQMottled Willowfly
Strophopteryx fasciata · Order: Plecoptera · Family: Taeniopterygidae
Also called: Early brown stonefly
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The mottled willowfly (Strophopteryx fasciata) is a winter stonefly in the family Taeniopterygidae. It lives in North America, where its herbivorous larvae develop in water and become adults in late winter to early spring.
Source: Wikipedia
How to recognize it
Strophopteryx fasciata is called the mottled willowfly or early brown stonefly.
Source: Wikipedia
Where it lives
It is found in North America.
Source: Wikipedia
What it eats
The larvae feed on plant material.
Source: Wikipedia
When you see it
Adults appear in late winter to early spring.
Source: Wikipedia
Where it comes from
Its native range is North America.
Source: Wikipedia
Where it is found in the US
Recorded in 28 of 51 states and DC. Most records: Indiana, Illinois, West Virginia, Arkansas, Minnesota, Wisconsin, Ohio, Missouri.
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
Questions people ask
Sources
- Wikipedia: https://en.wikipedia.org/wiki/Strophopteryx_fasciata
Look it up elsewhere: GBIF · iNaturalist · BugGuide · ITIS · Wikipedia
Text written 2026-10-23 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-23.