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The female is much larger than the male; she has a length of 20–25 millimetres (0.79–0.98 in), while the drone usually is not more than 16 millimetres (0.63 in). The bumblebee is black, with the last abdominal segments coloured orange-red.
Due to its parasitic lifestyle no workers exist.
Bombus rupestris is found in flower-rich habitats, such as meadows and along hedgerows. The bumblebee parasites the nests of Bombus lapidarius, the red-tailed bumblebee, whose queen is killed or subjugated.
- "Bombus rupestris (Fabricius, 1793)". Biolib.cz. http://www.biolib.cz/en/taxon/id70375/. Retrieved 4 July 2012.
- Discover Life. "Discover Life map of Bombus rupestris". http://www.discoverlife.org/mp/20m?kind=Bombus+rupestris. Retrieved 28 February 2009.
- Jim Lindsey (retired professor of Biostatistics). "Bombus rupestris". http://popgen.unimaas.nl/~jlindsey/commanster/Insects/Bees/SuBees/Bombus.rupestris.html. Retrieved 28 February 2009.[dead link]
- Dr Brian Nelson, Ulster Museum. "Bombus (Psithyrus) rupestris – a cuckoo bumblebee". National Museums Northern Ireland. http://www.habitas.org.uk/priority/species.asp?item=9858. Retrieved 28 February 2009.
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