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Photo#175622
Congregation of male wasps? - Polistes fuscatus - male

Congregation of male wasps? - Polistes fuscatus - Male
Perry County, Pennsylvania, USA
is it normal for male polistes to congregate like this? there is something about this corner by the chimney... every fall male polistes gather in the same spot. my brother would knock them down, and then 10 min later they would all be back again.

congregation on new peach tree
There are about twenty of them just hanging packed on a couple peach tree leaves. This is the first year the trees have been this big and the wasps sure weren't there last year. They've been here around a week. They look like they're communing with each other, legs on their neighbors and antennae touching.

Communal roosting place for males
A widespread behavior, not only in Polistes but in some Hormets too (Oriental Hornet Vespa orientalis from Eastern Mediterranean is especially prone to do this).
But despite frequent occurence, there is something of a mystery there, as you point out. What is actually the "something" who induces the insects to gather there and nowhere else, and year after year at the same place?

 
Cool!
this is the only place i have ever seen them gather before.. i have never seen any other species do this, only fuscatus. and yes, every year they are in the same spot. i dont know how or why they do it... how would they know to come there? an interesting experiment that i am planning on doing is marking males from a certain nest with a certain color of paint(just a little dab on the top of the thorax.) that way i can see if it is only males from one nest or not.

i guess its only the males that do this since they have nothing else to do...

 
should i add
this image to the guide under polistes since it shows this behavior?

 
I think it would be useful...
to add them, even if they are very many images of P. fuscatus.

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