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Leafcutter bee/mason bee nests?

Leafcutter bee/mason bee nests?
Howell, Monmouth County, New Jersey, USA
December 27, 2009
This is a nest of the pipe organ mud dauber (Trypoxylon Politum). The holes from hatched wasps seem to have been used by another bee or wasp with leaves. I never saw what hatched out. Can anyone ID what made these?


Moved from ID Request.

Not really seeing that....
Aside from the unusual stain around the edges of the holes, I don't see anything that indicates what you are suspecting...You need to carefully take the nest apart and get some shots of what is inside. Could simply be scavenger insects eating the old spider remains, remains of the pupal cocoon, etc.

I know its not leafcutter bee
It might not be leafcutter or mason bees, but something of that nature. That unusual stain isnt a stain but leaf peices plastered over the holes, and something hatched out of them.

If those are leaf pieces,
(and it looks that way to me) then I think these would have to be leafcutter bee nests. Megachile species make their nest cells out of perfectly rounded circular and oval leaf pieces, but some other megachilids use more irregular pieces, I think. Some plaster over the hole with resin, which may be the case here? Mason bees make their cells entirely out of mud/clay, so we can rule them out. Neat find!

Thanks! Yes those are peices of leaves, so it must be a species of leafcutter bee. I didnt think they were at first because i never saw them use the nest of mud daubers. Also, this is a big multi generation mud dauber nest and its likely that it was still being used by the wasps when the leafcutter bees used it

I saw a leaf cutter bee enter
I saw a leaf cutter bee entering the nest made by a mud dauber at my house yesterday. I watched the mud daubers building the nest last year. This year, the leaf cutter bees have taken over the nest and using it for their own.

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