The Ribbed Pine Borer is a stout longhorn beetle with grayish-brown elytra bearing coarse ribs and dark irregular banding that blends well with rough tree bark. Adults overwinter as mature beetles inside pupal chambers and emerge early in spring — one of the first longhorns active each year. They are frequently found basking on dead pine logs and stumps.
Best time to see a Ribbed Pine Borer
The best time to see a Ribbed Pine Borer is March–June, when about 67% of U.S. sightings happen, based on 913 research-grade iNaturalist observations.
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