Mud Daubers University of Maryland Extension

Mud daubers are dark, often metallic black or blue wasps. They are not aggressive.

Predatory Wasps University of Maryland Extension

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black and yellow mud dauber - Sceliphron caementarium

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University of Maryland Extension University of Maryland Extension

Check out this old nursery of Organpipe Mud Dauber Wasps!

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Docile Dirt Daubers, Nature of the Lake

Scoliid Wasp University of Maryland Extension