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Black bugs w/ white cocoons

Black bugs w/ white cocoons
Arizona, USA
August 23, 2017
These bugs have invaded my laundry room. They create little white cocoons in any crevice they can find (so far it's been mostly in clothes, though I have found in wall corners). The cocoons are practically impossible to wash off but they haven't caused any actual clothing damage. Would love to know what I'm dealing with here. Thanks for your help!

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Black bugs w/ white cocoons Black bugs w/ white cocoons Black bugs w/ white cocoons

Frassed
Moved from Beetles.

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