Moved from Potter and Mason Wasps.

Moved from Ancistrocerus.

I am quite certain that this is not an Ancistrocerus even though I can't make an alternative suggestion (not familiar enough with the southwestern fauna). I have examined almost all the North American species of Ancistrocerus, and they all look very different. I guess we'll have to leave this one for another day... Thanks, Tom, for contributing images of such interesting species!

At least, this nectaring specimen is a female. But it looks almost too red to be an A. tuberculocephalus, unless there is considerable regional variation. I ignored such a Hornet-like color-pattern (especially on mesoscutum) could exist at all in this genus.

As it took a long time, I thought connexion had failed. Is it possible to cancel when this occurs?

Polistes Perplexus but I'm not certain about that.