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Photo#251518
Pipe organ mud dauber - Trypoxylon politum

Pipe organ mud dauber - Trypoxylon politum
Ackworth, Warren County, Iowa, USA
February 1, 2009
Size: 8 cm
Several nests plastered onto interior garage walls.

Not an expert
but maybe Trypoxylon politum (Pipe organ mud dauber)

 
Looks right!
Thanks, John. That certainly resembles all the other images in the gallery. I have seen the black adults around in summer, just never connected the two for sure.

One speculation: it looks to me like the dauber constructed the tubes in my photo from left to right, using the upper right corner of the preceding tube as a foundation for the next, resulting in an upward curving sequence with the rightmost one strongly draped over its neighbor. Sound right?

 
Not sure
I've never seen them, but maybe someone else will comment.

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