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Species Page - Stenocorus obtusus
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scientific name    Stenocorus obtusus    

habitat
Found in sub-alpine meadows on soil surface or on the stems and flowers of various angiosperms.

seasonality
Adults common from May to August (Gardiner 1970; Linsley and Chemsak 1972).

identification
Length 10-17 mm (Linsley and Chemsak 1972). The head is narrowed posteriorly and rounded laterally (Leng 1890). The eyes are small, convex, and finely granulated (Casey 1913). The third and fifth antennal segments are equal in length; the fourth antennal segment is two thirds as long as third and fifth (Casey 1913). The eleventh antennal segment is longer than the tenth (Linsley and Chemsak 1972). A very fine pubescence covers the body (Leng 1890); the head is fuscous, and the posterior body is testaceous in color (Casey 1913). The elytra are narrowed and rounded at the tip, the sutural angle is obtuse (Casey 1913). The prothorax is shorter than it is wide; it surface convex; constricted anteriorly and posteriorly and bisinuate laterally (Casey 1913). The lateral protuberance is not well developed and the lateral tubercles are obtusely rounded (Casey 1913). S. obtusus are very sexually dichromatic (Linsley and Chemsak 1972). Males may be all black or pale with black appendages and vittate elytra. Females have a uniformly yellowish elytra and reddish appendages and prothorax (Linsley and Chemsak 1972). However dichromatic characteristics are not universal, few male specimens have been identified with unicolorous elytra and few female specimens have been identified with vittate elytra (Hopping 1937). S. obtusus can be distinguished from similar species by the small, convex eyes (Leng 1890); evenly rounded elytral apices (Linsley and Chemsak 1972), and the lateral edges of pronotum having obtusely rounded tubercles (Linsley and Chemsak 1972).

life history
Most cerambycid larvae are wood boring and may be very destructive to trees impacting forestry and agriculture (Triplehorn and Johnson 2005).

conservation
Not of concern.

diet info
All cerambycids are phytophagous and most Lepturinae larvae are wood borers (Borror and DeLong 2005). Stenocorus obtusus adults can be found on stems of Lupinus sp. (Linsley and Chemsak 1972), or on the flowers of Achillea, Heracleum, and Galium (Linsley and Chemsak 1972).

range
The type locality is the Yellowstone Basin (LeConte 1873). Specimens have also been recorded from Alberta, British Columbia, Washington, Wyoming, Idaho, Oregon, Colorado and Nevada (Barr and Penrose 1969; Canorva 1936; Hopping 1937; Linsley and Chemsak 1972).

quick link
http://entomology.museums.ualberta.ca/searching_species_details.php?s=5864



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References (9)
Specimen Info
There are 10 specimens of this species in the online database
Map Distribution
Adult Seasonal Distributioncreate a collection histogram with specimens
Specimen List (10)

 

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