This is a bit arcane, but some of you may find it interesting (maybe only Teleutotje)
Dear ant folk:
If you followed my suggestion from the 1980s, and Barry Bolton’s similar suggestion in the 1995 print version of his catalog, that Monomorium viridum should be called “M. viride”, now is the time to desist from any further usage of this latter form. Note that the change to “viride” was never formally proposed as an emendation of the original name, and Barry Bolton has made a decision to dispense with even citing the form “viride” in the updates to the catalog, even though it appears in various publications and websites.
So here you have it, right out of the latest update to catalog, the entry on this species:
viridum. Monomorium viridum Brown, 1943: 243 (w.q.) U.S.A. Crozier, 1970: 116 (k.); DuBois, 1986: 98 (m.). Senior synonym of peninsulatum: DuBois, 1986: 96.
And here is Barry’s reasoning, edited from two separate messages. I accept his argumentation, as should we all (even though it grates on my Latin sensibilities):
"… As for Bills' Monomorium, his original spelling was viridum, not viridis. If the latter it would require emendation to viride of course, but viridum is not a Latin word (though maybe Bill thought it was), so I just leave it as a neologism with a latinised neuter ending.
… As you saw, viridum is present in the catalogue (as… [above]), not viride. It has not been there as viride for quite a while.
Back in the original (1995) printed version of the catalogue I had viride, as I had mistakenly recorded that Bill had viridis in the original combination. My error entirely, but as soon as I saw that Bill's original was viridum, I switched the entry to that.
In my opinion, viridum can not be altered to viride because viridum is not a Latin word. It stands … as a neologism, or maybe even an arbitrary combination of letters, with a latinised neuter ending. There really is no need to alter it...
I regret my role in any confusion over the years, James
PS – Technically, this means, if you ever find a new species of Monomorium that is green, and want to describe it as “M. viride”, you could. But I would rather strongly discourage you from doing so!