For some reason, my two most active semi-claustral species still are refusing to hibernate.
Like you guys recommended, I put all of my ants in cold temperatures, and most of them dropped into hibernation. Sadly, some of my ants didn't seem to get the memo. The Myrmica queen nearly chewed out of her tube (now she's in a terrarium) and the Stigmatomma queen sucked one of the Aphaenogaster larvae that I provided dry.
Are they just not ready for hibernation yet?