CLOSED: Who made this?

Lucketts, VA(Zone 7a)

Last summer I moved two panels of siding stored outside and found this. Guessing some type of solitary bee or wasp. Any ideas?

Thumbnail by greenthumb99
Sinks Grove, WV

That would be my guess as well, but I must admit never having come across ones exactly like these. I'll let you know if I can come up with anything more definitive (in the meantime, perhaps someone else will leap on this one...)

Ovalo, TX

I cannot say either, but it appears to be similar to mud dauber nests we find in this area (West TX). It looks like they used 3 different sources of mud - hence, the three areas of different colors. Ours can get quite interesting when the source of wet mud changes from one color of soil to another. They DO love to get between layers of siding. They place a paralyzed spider into each egg casing to feed the larvae when they hatch. I have never seen one with the cells oriented this way though.

Sparta , TN(Zone 7a)

we call them Dirt dobbers here they collect spiders and such and lay their eggs in thecells and then close them up till they hatch much like the TX is saying .they build any where here

Lucketts, VA(Zone 7a)

We have Mud Dobbers that construct tubes on the side of the house, but the architecture is much different. The open sides of the cells in the photo are where the other piece of siding was used as a wall. All of the feature seen here (above) was built in the channel on the face of the siding as it acted as a tunnel when the two pieces were flat together.

Lucketts, VA(Zone 7a)

I recently attended a native bee talk by T'ai Roulston, native bee specialist and Curator, State Arboretum of Virginia. After describing this finding he asked me to send him a photo. He was quite puzzled by it too and posted it for other native bee investigators to comment on. Here is part of his reply:

"I received a number of responses regarding your photo, and all said the same thing: Osmia, perhaps Osmia lignaria (the blue orchard bee/blue mason bee). I am very familiar with this bee and it is common around here, but apparently it will make nest like this if there are no linear cavities available. People really liked the photo and were taken by the variation in size and shape of the cells and all the mud used."

Thank you T'ai

Anne Arundel,, MD(Zone 7b)

Neat David, great find ! So gratifying to have the pros take note.

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