Half-banded Bryolymnia

Bryolymnia semifascia · Order: Lepidoptera · Family: Noctuidae

No source yet on danger. We have no source yet on whether it bites, stings or damages anything.
Half-banded Bryolymnia
Photo: iNaturalist user, CC0

The adult moth's wingspan is about 26 to 29 mm. Adults are active from mid-June to mid-September.

Source: Wikipedia

Size

The adult moth's wingspan is about 26 to 29 mm.

Source: Wikipedia

When you see it

Adults are on the wing from mid-June through mid-September.

Source: Wikipedia

Where it comes from

It occurs in the United States from northern Colorado and southern Utah down to southeastern Arizona and south-central New Mexico.

Source: Wikipedia

Where it is found in the US

Recorded in 5 of 51 states and DC. Most records: Arizona, New Mexico, Colorado, Texas, Utah.

Darker = more records. Counts are museum and citizen-science records, not population size.

Source: GBIF

Status: native in North America; native in United States. Source: iNaturalist

Months it is reported in the US

JFMAMJJASOND

Source: GBIF

More photos

Half-banded Bryolymnia photo 2
Photo: Tom Kennedy, CC BY
Half-banded Bryolymnia photo 3
Photo: Laura Gaudette, CC BY
Half-banded Bryolymnia photo 4
Photo: Alina Martin, CC BY
Half-banded Bryolymnia photo 5
Photo: Sue Carnahan, CC BY

Same family (Noctuidae)

Ipsilon Dart MothIpsilon Dart MothAgrotis ipsilonDamages trees, gardens or cropsFall Armyworm MothFall Armyworm MothSpodoptera frugiperdaDamages trees, gardens or cropsArmy Cutworm MothArmy Cutworm MothEuxoa auxiliarisDamages trees, gardens or cropsLarge Yellow UnderwingLarge Yellow UnderwingNoctua pronubaDamages trees, gardens or cropsSilver ΥSilver ΥAutographa gammaAmerican DaggerAmerican DaggerAcronicta americanaCan irritate skin

Sources

  • Wikipedia: https://en.wikipedia.org/wiki/Bryolymnia_semifascia

Look it up elsewhere: GBIF · iNaturalist · BugGuide · ITIS · Wikipedia

Text written 2026-10-27 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-27.

How this page works

This is one bug's fact sheet. The colored box at the top says whether it is dangerous. Sections below cover how to recognize it, whether it is a pest, and how to deal with it. The US map shows which states have records; tap a state to see other bugs there.

Every fact on Bug FAQ comes from a named source (university extension sites, government agencies, GBIF, iNaturalist, Wikipedia). The source is linked next to each section. If we have no source for something, we leave it out.