הזיהויים של melvio

See the worker specimens with a hairy thorax dorsum, setae count greater than 12. These workers happen to be infected with Aegeritella sp. fungus:

https://www.inaturalist.org/observations/215997598

I found a dead queen just two meters away from this nest. Based on Seifert's key, the ventral surface of first gaster sternite should have more than 24 setae in lateral view, which this queen specimen definitely has. With no sight of F. polyctena colonies nearby, I am certain that this queen also belongs to F. rufa and is probably from the same colony.