Bombus sitkensis er tegund af humlum,[2] útbreidd í vesturhluta N-Ameríku.[3][4]
Tilvísanir
- ↑ Hatfield, R., et al. 2015. Bombus sitkensis. The IUCN Red List of Threatened Species. Downloaded on 10 March 2016.
- ↑ Bisby F.A., Roskov Y.R., Orrell T.M., Nicolson D., Paglinawan L.E., Bailly N., Kirk P.M., Bourgoin T., Baillargeon G., Ouvrard D. (red.) (2011). „Species 2000 & ITIS Catalogue of Life: 2011 Annual Checklist“. Species 2000: Reading, UK. Sótt 24. september 2012.
- ↑ Koch, J.; J. Strange & P. Williams (2012). „Bumble Bees of the Western United States“ (PDF, 7.56 MB). The Xerces Society. Sótt 30. janúar 2013.[óvirkur tengill][óvirkur tengill]
- ↑ Thorp, R. W.; og fleiri (febrúar 1983). „Bumble Bees and Cuckoo Bumble Bees of California“ (PDF (6,94 MB)). Bulletin of the California Insect Survey. University of California Press. 23: 42–43. ISBN 0520096452. Sótt 27. júlí 2011.
