Summary ⁴

Size:
Queen 18 - 23 mm
Worker 10 - 16 mm
Male 12 - 18 mm
Plant Association: Cirsium, Dipsacus, Helianthus, Medicago, Phacelia, Trifolium
Nest: Nests underground or on the surface of the ground
Similar Species:
Rusty-patched Bumble Bee (B. affinis)
Southern Plains Bumble Bee (B. fraternus)
Morrison's Bumble Bee (B. morrisoni)
Red-belted Bumble Bee (B. rufocinctus)
Phenology:
Males: Late July to Early September
Workers: Slow increase from April to Mid-June, Full peak from Mid-June to Late September
Queens: Late March to Late June, Small peaks in August and November

Sources and Credits

1. (c) Jacy Lucier, some rights reserved (CC BY-SA), http://commons.wikimedia.org/wiki/File:Bombus_griseocollis_queen.jpg
2. USGS Bee Inventory and Monitoring Lab, no known copyright restrictions (public domain), http://commons.wikimedia.org/wiki/File:Bombus_griseocolis,_F,_Back,_MD,_PG_County_2013-07-10-16.16.49_ZS_PMax_(10058868996).jpg
3. Chloé Recouvreur, no known copyright restrictions (public domain), uploaded by Chloé Recouvreur, https://www.fs.fed.us/wildflowers/pollinators/documents/BumbleBeeGuideWestern2012.pdf
4. Adapted by Ashlee Hardin from a work by (c) Chloé Recouvreur, some rights reserved (CC BY-SA), https://www.inaturalist.org/guide_taxa/1680407

More Info

• iNaturalistAU taxon page
• Animal Diversity Web
• Biodiversity Heritage Library
• BOLD Systems BIN search
• BugGuide
• CalPhotos
• CUIC Insect Images
• Global Biodiversity Information Facility (GBIF)
• Guide to Bumble Bees of Texas, Oklahoma, Arkansas, Louisiana, and Kansas
• Maryland Biodiversity Project
• NatureServe Explorer 2.0

iNaturalistAU Map