Red-tailed Bumblebee Bombus lapidarius

Red-tailed Bumblebee Queen
Red-tailed Bumblebee worker
The Red-tailed Bumblebee queens and workers are all black except for a fox-red "tail" (end of abdomen).
Red-tailed Bumblebee male on rose
Red-tailed Bumblebee male on knapweed
The Red-tailed male has a similar appearance to the females with the addition of a canary yellow bar across the upper thorax and yellow hair on the face.
Red-tailed Bumblebee male
Red-tailed Bumblebee male on knapweed
Red-tailed Bees mating
Sometimes the male has another slight yellow bar across the lower thorax and even one on the abdomen; sometimes males have no yellow bars at all. They can also show faded, off-white bars. Above right shows the size comparison of the queen redtail and the mating male.
Red-tailed Bumblebee queen
Red-tailed Bumblebee queen
This Red-tailed queen is an inch (25mm) long. Typically queens are 20-23mm, males 14-16mm and workers 11-16mm head/body length.
Red-tailed Bumblebee worker with pollen basket
Red-tailed Bumblebee worker with full pollen basket
Red-tailed Bumblebee worker with pollen basket
Red-tailed workers with full pollen baskets.
Red-tailed Bumblebee worker
Red-tailed Bumblebee
Red-tailed Bumblebee
Other red-tailed Bumblebees include the Early Bumblebee (Bombus pratorum) whose males have more yellow on their shoulders and abdomen, the Red-shanked Carder (also called Red-tailed Carder, Bombus ruderarius) which has a ginger tail and shorter, squat abdomen and the Hill Cuckoo Bumblebee (Bombus rupestris) which has a stepped abdomen and parasitises the Red-tails' nests.
There are also small hoverfly mimics of the male and the female Red-tailed Bumblebee.