Jonathan: Thanks for your investigative efforts. Much appreciated.

Moved from Rhynchophion.

I've managed to track down and review the descriptions of all of the described species (luckily only 4). In other records from Celestyn Brozek (2019) and Charles W. Melton (2009), I'm quite certain the mouthparts indicate a Rhynchophion given the elongate maxillae and labium. I've also since been able to sort out the other Thyreodon species, and both of the red-marked species still have more black markings to the body, including the femora. Here's an overview of the Rhynchophion species:

• R. flammipennis (Arizona to Ecuador) - entire body and legs are always black, antennae yellow to black
• R. ligulifer (Brazil) - body and basal half of flagellum are black
• R. odontandroplax (Brazil) - head and antennae black, thorax, abdomen, and legs black with blue sheen
• R. woodi (Costa Rica) - body reddish-brown, antennae yellow

So of the described species, only a single species deviates from a black body: R. woodi. I'd previously noted in correspondences that this species is suspected to be a mimic of Polistes canadensis, which fits what I see here. Also, two of its known hosts are found in Arizona. Since neither of the species from Brazil fit (at all), I think these are safe to move to a new species page. Since the Costa Rican material keys in part based on body color, that seems to be a fairly safe move given the points above.

Moved from Ophioninae.

Thyreodonini, for sure. As for genus and species, we don't have them in California, so I am not quite sure for now. I'll try to do some reading.

Moved from Ophioninae.

Moved from Ichneumon Wasps.