I'm going to guess here that this could be Lasius flavus in that hope that others may confirm or correct me. (Thanks Furryscaly!)I don't know enough about ants to differentiate species (any input from people who know would be appreciated!), but I do enjoy uncovering and observing their amazing societies and behaviors. Allegany County, NY, USA
2010.08.25 Vienna XXII. (Hausgraben - bayou 153 m AMSL).Oligolectic on Dipsacaceae family.German name: "Dipsacaceen-Sandbiene" (couldn't find a German name) (+ Borsten-Karde)ID: Johann Neumayer @ naturbeobachtung_at; he mentions there that this species is oligolectic, i. e. collecting pollen only from plants of the Dispacaceae family (in Austria preferably from Scabiosa, Succisa and Dipsacus); I've found contradicting opinions on the www but as this man is an expert in the field I trust his judgement