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Extension > Garden > Diagnose a problem > What insect is this? > Insects found indoors > Winged Insects - 1/2 inch and greater > Horntail

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Tremex columba


Jeff Hahn, University of Minnesota


Steve Katovich, USDA Forest Service,

Size: 1 - 2 inches long

Description: Cylindrically shaped insects; reddish brown head, reddish brown and black thorax, and a black abdomen with yellowish stripes; also has long, amber-colored wings; females possess a conspicuous ovipositor.

Where/When: Occasionally found indoors, primarily in the winter. Horntails are typically associated with firewood, especially maple, oak, and elm.

Significance: They are harmless to people and do not re-infest wood or otherwise damage property; they are just a nuisance.

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