Bug FAQDark-shouldered Long-horned Beetle
Brachyleptura circumdata · Order: Coleoptera · Family: Cerambycidae
The dark-shouldered long-horned beetle is smaller than its relatives, measuring about 7 to 10 mm. Its larvae feed on spruce and possibly pine trees. Adults are most active during June and July.
Source: Wikipedia
Size
Adults are 7 to 10 mm long, which is smaller than other species in the genus.
Source: Wikipedia
What it eats
Larvae eat the wood of spruce and may also feed on pine.
Source: Wikipedia
When you see it
They are most active in the months of June and July.
Source: Wikipedia
Where it is found in the US
Recorded in 20 of 51 states and DC. Most records: Pennsylvania, Illinois, Kentucky, Michigan, Massachusetts, Connecticut, Georgia, South Carolina.
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
How big is the dark-shouldered long-horned beetle?
It measures about 7 to 10 mm, making it smaller than other beetles in its genus.
Source: Wikipedia
What do the larvae of this beetle eat?
The larvae feed on spruce and possibly pine trees.
Source: Wikipedia
Same family (Cerambycidae)
House LonghornHylotrupes bajulusCan damage your home
Asian Longhorned BeetleAnoplophora glabripennisDamages trees, gardens or crops
Red Milkweed BeetleTetraopes tetrophthalmus
White-spotted SawyerMonochamus scutellatusCan damage your home
Red Pine Longhorn BeetleStictoleptura rubra
Spotted Longhorn BeetleRutpela maculataSources
- Wikipedia: https://en.wikipedia.org/wiki/Brachyleptura_circumdata
Look it up elsewhere: GBIF · iNaturalist · BugGuide · ITIS · Wikipedia
Text written 2026-10-28 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-28.