Species Details
Monochamus obtusus
University of Alberta E.H. Strickland Entomological Museum Read more about this collection »
SeasonalityAdults are active from June till August (Linsley and Chemsak, 1984).
Identification14-24 mm, integument reddish brown, abdomen black, hairs gray or brown. Antennae extending 5 segments past elytra in males and 3 segments past in females. Small round lateral projections on pronotum. Scutellum v-shaped with white hairs on sides. The subspecies Monochamus o. obtusus is distinguished by darker integument and hairs with reduced gray hairs. Monochamus o. fulvomaculatus has light brown integument with numerous gray hairs (Linsley and Chemsak, 1984).
Scientific Name
Monochamus obtusus
Habitat
Pine woodlands.
Seasonality
Adults are active from June till August (Linsley and Chemsak, 1984).
Identification
14-24 mm, integument reddish brown, abdomen black, hairs gray or brown. Antennae extending 5 segments past elytra in males and 3 segments past in females. Small round lateral projections on pronotum. Scutellum…
14-24 mm, integument reddish brown, abdomen black, hairs gray or brown. Antennae extending 5 segments past elytra in males and 3 segments past in females. Small round lateral projections on pronotum. Scutellum v-shaped with white hairs on sides. The subspecies Monochamus o. obtusus is distinguished by darker integument and hairs with reduced gray hairs. Monochamus o. fulvomaculatus has light brown integument with numerous gray hairs (Linsley and Chemsak, 1984).
Life History
As in other Monochamus species adults will feed for a short period, mate, and the female will lay eggs in irregular shaped holes in coniferous trees. Larvae will emerge and begin feeding on the wood under the bark…
As in other Monochamus species adults will feed for a short period, mate, and the female will lay eggs in irregular shaped holes in coniferous trees. Larvae will emerge and begin feeding on the wood under the bark causing oval shaped tunnels. No information on the duration of the lifecycle is mentioned, but since they only occur in warmer areas one could assume it is the 1 year cycle.
Conservation
Uncommon.
Diet Info
Larvae and adults have been known to feed on dead and dying pine, true firs, and Douglas fir (Linsley and Chemsak, 1997).
Range
Occur in British Columbia, Idaho, Washington and California (Linsley and Chemsak, 1984).
Citation
Page Citation for Monochamus obtusus
Page Citation
"Species Details - Monochamus obtusus, University of Alberta E.H. Strickland Entomological Museum." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/g/2-5876. Accessed 01 Apr. 2025.
References
Author
Linsley, E. G. and A. Chemsak
Title
The Cerambycidae of North America, Part VII, No. 1: Taxonomy and classification of the subfamily Lamiinae, tribes Parmenini through Acanthoderini.
Publication Date
1984
Series Title
University of California Publications in Entomology
Volume
102
Pages
258 pp
Author
Linsley, E. G. and A. Chemsak
Title
The Cerambycidae of North America, Part VIII: Bibliography, index, and host plant index.
Publication Date
1997
Series Title
University of California Publications in Entomology
Volume
117
Pages
534 pp
Specimen Information
There is 1 specimen of this Species.
UASM53847 - Monochamus obtusus
University of Alberta E.H. Strickland Entomological Museum
Place CollectedUnited States: California, Alameda county, Oakland
Collected ByLinsley, G.
Date Collected1925-08-19