Mischocyttarus:
I'm much less confident about separating the darker southern forms of M. m. mexicanus and M. a. angulatus, and it's likely that I mis-ID'd all the observations in Mexico.

Agelaia:
Agelaia are way more difficult to ID to species than I previously thought, and pretty much all the IDs I've suggested should be reconsidered.

1. As far as I can tell, A. areata is impossible to visually distinguish from the yellower forms of A. yepocapa (though it looks like the darker forms of A. yepocapa can be separated), a striped form of A. pallipes, and the yellower forms of A. x. xanthopus (by patterns alone).
2. As far as I can tell, A. cajenennsis is visually identical to A. pleuralis (by patterns alone).
3. As far as I can tell, A. yepocapa is visually identical to A. x. xanthopus (by patterns alone).

More to come as I upload my poor-quality photos of the collections to iNaturalist.