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Photo#174334
Blue mud dauber wasp - Chalybion californicum

Blue mud dauber wasp - Chalybion californicum
West Devon, York County, Prince Edward Island, Canada
July 27, 2006
Size: 2 cm
Several of these large black beetles were observed on the side of a weathered farm shed.

Edit: name changed

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Blue mud dauber wasps - Chalybion californicum Blue mud dauber wasp - Chalybion californicum Blue mud dauber wasp - Chalybion californicum

Moved
Moved from Beetles.

Moved
Moved from Beetles.

You can make out the two small occelli
between the eyes, a sure sign of Hymenoptera.

Blue mud daubers.
These are blue mud daubers, Chalybion californicum. Males are known to congregate in large "sleeping clusters," and I'm sure that is what you were observing.

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