It's a bit tough for me to work through Townes papers (with all the idiosyncratic nomenclature, etc.). But am I safe in assuming his ovipositor length character below (from pg. 120) still works?

    1a) Ovipositor sheath 0.35 to 0.5 as long as forewing; (etc.) .....Gasteruption (sensu stricto of Townes)
    1b) Ovipositor sheath 0.8 to 2.5 as long as forewing; (etc.) ....."Rydinofoenus" ( = Gasteruption of others?)

Townes placed just three species under Gasteruption, namely: amputatum, assectator, and kirbii. I believe all the taxa Townes had under Rydinofoenus are treated by others as being in Gasteruption. As catalogued in the 1979 "Red Book", there were 15 species in Gasteruption...so if the ovipositor length character is still good that narrows things down considerably in the "short ovipositor" case!

Also, I'm assuming that for amputatum the character "ovipositor tip white (on distal 0.12 of length) " is still good (and perhaps the Arizona + Mexico distribution too). Thus I assumed we could easily pick off any posts with short, entirely black ovipositors and move them to the assectator/kirbii guide page.

...but...I'm guessing its Townes "length-to-width ratio for the 2nd hind tarsus" that may be what gave you pause? That's what I used to place my post here...and I could imagine that it may by "iffy". (Especially in photos, where the angle of view may distort that ratio.)

I don't mind moving this post to the assectator/kirbii guide page if you think that's more appropriate. (But I do wonder, if the hind tarsus character is not dependable...then what does one to separate assectator and kirbii?)