Jewel Beetle: Golden Buprestid

What’s this bug?
April 24, 2010
I found two of these eating there way out of an old tree stump. As soon as they ate there way up they sat on the log for awhile drying their wings I presume then flew off. They are a beautiful color of greens and golds.
Groveland, CA

Golden Buprestid

Dear Patti,
Congratulations on witnessing the emergence of two Golden Buprestids, Buprestis aurulenta, from their larval home. Golden Buprestids are in the family Buprestidae, and those family members are collectively called Jewel Beetles or Metallic Borer Beetles.  The larval stage may last many years, and there are records of adults emerging from previously milled lumber long after the trees were cut.  According to our frequent contributor Eric Eaton:  “The record age for one is an adult that emerged from a baseboard(?) in a Canadian building fully 51 years after the building was erected! Why milled lumber forces such an extended life cycle in woodborers is a mystery, at least as far as I know. Normally, the life cycle would be no more than 2-5 years.

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