Monomorium ergatogyna: Basically M. minimum, but more abundant in California. They're escape artists and have gotten out of almost every formicarium I've put them in (except for a sealed one with zero openings at all for them to escape out of, which I ended up neglecting). On the plus side, they're easy to find (they don't fly, but I dig up small portions of wild colonies), are extremely polygynous, and are inbreeders, so it's pretty easy to get a big colony out of a few queens and workers in no time.
Tetramorium immigrans: Fun at first because they grow insanely fast, but get way too hard to deal with over time. They get past barriers easily and empty feeders faster than you'd ever believe. Despite that, I'll have another go at them next year...
Prenolepis imparis: They grow insanely slowly, have a rather high mortality rate, and diapause in the summer. They're actually not that bad in my opinion, since you can just leave them alone for half the year (in the founding stage at least) and focus on your other ants, then while your other ants are in hibernation you'll have some time for them.
Tapinoma sessile: So annoying because they never move the way you want them to. I tried to move a queen and a few workers from the deli cup I caught them with into a test tube, but they refused to nest in the tube. Instead, they seemed to be more interested in just putting all their brood and chilling at the bottom of the cup. I had to dump them into the tube in the end.
Linepithema humile: We all know why lmao.
Same with the monomorium. Only thing that contains mine is Vaseline. They can even get out of the lid to the mini hearth.
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Feel free to read my journals, like this one.
Wishlist:
Atta sp (wish they were in CA), Crematogaster cerasi, Most Pheidole species