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Roosting male bees and wasps (Hymenoptera)

It seems that we have a collection of aggregations of sleeping bees in Bugguide. I have a picture of two sleeping carpenter bees that I never thought of submitting to Bugguide; maybe I will.
I am sure that there are more pictures and I would like to see them. I would also want to know more about this behavior. I understand that there is an aggregation pheromone.



There are also some images of aggregations of wasps.


And here is a group of Braconids


Not quite an article but it eventually may become one so it is better to keep it here.

Update, 8/5/2010: A few interesting observations on roosting insects

Sleeping aggregations of Idiomelissodes duplocincta
In a desert garden. Observations on aggregations of sleeping Idiomelissodes duplocincta males. Pages 83 and following
J. Kansas Entomol. Soc.
Contributed by Beatriz Moisset on 15 May, 2009 - 8:30pm
Last updated 2 August, 2018 - 7:27am

Very Interesting indeed!
Here are some Ammophila roosting groups that I came across - males I suppose?
… Jim Moore, 18 January, 2014 - 5:19pm

Along those lines
Here is a similar situation I found last summer. The group, upwards of 20 or more, used to same flap of bark on an old wood fence for a number of weeks.

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… Karl Volkman, 17 May, 2009 - 10:39pm

Roosting insects
Here's an article I came across that discusses insect roosting in general. I don't remember how much it talks about roosting in male Hymenoptera in particular.
… Charley Eiseman, 16 May, 2009 - 4:50pm

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