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They are the same ones I've seen. Do they have some degree of worker polymorphism? Does anyone know why they are not more common? Once they are established in a location, they seem to be quite dominant. Also, they almost always seem to be associated with dead/dying trees. L. niger don't tend to nest in those locations, so how does the parasitism work.
Also, there doesn't seem to be very much information on them or on L asius brunneus for that matter.
This species is a social parasite of Lasius umbratus, which is a social parasite of L. niger. As far as I know this L. fuliginosus can also use L. niger as a host but less effectively. There have been experiments on this, if you can read Dutch check out http://antforum.be/viewtopic.php?f=72&t=1217 and http://antforum.be/viewtopic.php?f=72&t=557. There has been successful colony founding using L. niger as a host, but the multiple queens killed each other until only one was left, probably under influence of the L. niger workers who are a monogyn species.
Thank you for those links. In reality the translation from Dutch to English is very bad. Can you summarise?
I can always translate a few things. ;) If you tell me which part you like me to translate.