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Orussid wasp

Orussus occidentalis


About 10-12 mm in length, colored as shown. Note antennae inserted very low on face; crown of blunt teeth on top of head.


Found 3-4 specimens running around on a huge old cottonwood log in a grove of live cottonwoods. Surrounding habitat is mostly degraded shortgrass prairie, cholla cacti being the tallest vegetation. Some riparian areas scattered across the ranch.


Despite being parasitic on woodboring insects, orussids are most closely related to sawflies.

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Spotted by

Pueblo, Colorado, USA

Spotted on Apr 21, 2014
Submitted on Apr 25, 2014

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