Rocky Mountain National Park, Larimer County, Colorado, USA August 10, 2013 Size: BL ~ 19.5 mm
This Bombus queen is on Goldenrod at Hidden Valley, 9240' elevation, Rocky Mountain NP. While we were photographing her, a male flew in, mated with her and left. I will post that photo and two others. Possibly one of the many variations of B. rufocinctus?