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Photo#292695
Insect Crawling Into Decaying Fence

Insect Crawling Into Decaying Fence
Berkeley, Alameda County, California, USA
June 16, 2009
Size: About 1 inch.
Found crawling into decaying wood fence. Looks like pictures of flower longhorn, but not sure. Want better ID so I know whether it's causing decay or not.

Frassed
Moved from Lepturini.

Xestoleptura crassipes?
This one from San Leandro looks right:

You are right
in that this is a Long-horned Beetle. I cannot tell from your photo whether it is one of the Flower Longhorns because the wasp mimicry pattern is wide spread in the whole family. They do not cause the rotting of wood, but they might be attracted to untreated rotting wood. Or fresh wood, or freshly cut branches, or fresh burns - every species has its own specialties. Most stay away from treated and kiln dried wood that is usually used in building. Where you live, check for dry-rot termites.

 
Another One...
I found this one on 6/22 just south of you in Fremont. I had no idea what it was until I saw your post.

 
Longhorned Beetle
Thanks, margarethe. I have another picture of it, but it's not better.

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