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Megachilidae bee? - Trypoxylon

Megachilidae bee? - Trypoxylon
Madison, Dane County, Wisconsin, USA
July 19, 2015
Size: less than one inch long
I have this bee in a bee box I made with about 3/8" diameter holes (I think). I haven't been able to get a photo of any other perspective other than the face. I think it's in the Megachilidae family, but that's only a guess.

Moved from ID Request.

Not a bee...
This is a keyhole wasp in the genus Trypoxylon. They are related to the common Organ-Pipe mud dauber, which you've probably seen before since they build familiar tube shaped nests:

These are about half the size though, and nest in cavities instead of building free-standing nests. These are much rarer than most Megachilids, so you can count yourself lucky to have one nesting in your nestbox :D

Here's a pic of one's face to compare:

And a pic of the wasp itself (note the similarity to the organ pipe mud dauber):

Trypoxylon wasp
Very cool. Thanks.

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