I know, I know, I'm probably too fussy, but Formica fucsa are whole black
I didn not see any Formica species witch such coloration (nevertheles, I like it!) but it will be more like Formica rufibarbis (you can see their queen on my avatar; or other B&Red Serviformica subgenus which might become host of ants from Formica sensu stricto subgenus).
Formica rufibarbis are known from that their coloration is not that stable - there are workers with more or less red on thorax inside one colony.
There are also other R&B species of Formica (and I know only European myrmecofauna), but I suppose it would be not right to call it with any Formica species that belong to Formica sensu stricto subgenus (such as Formica rufa, F. pratensis, F. polyctena, F. truncorum and etc. or F. sanguinea which belongs to Raptiformica) because they do not become slaves.. They make slaves
I didn not see any Formica species witch such coloration (nevertheles, I like it!) but it will be more like Formica rufibarbis (you can see their queen on my avatar; or other B&Red Serviformica subgenus which might become host of ants from Formica sensu stricto subgenus).
Formica rufibarbis are known from that their coloration is not that stable - there are workers with more or less red on thorax inside one colony.
There are also other R&B species of Formica (and I know only European myrmecofauna), but I suppose it would be not right to call it with any Formica species that belong to Formica sensu stricto subgenus (such as Formica rufa, F. pratensis, F. polyctena, F. truncorum and etc. or F. sanguinea which belongs to Raptiformica) because they do not become slaves.. They make slaves