Bombus cockerelli
Bombus cockerelli, Cockerell's bumblebee, is a yellow and black bumblebee known only from fewer than 30 specimens, collected at a few high-altitude localities in the White Mountains of New Mexico, all within an area of less than, giving it the smallest range of any of the ~250 species of bumblebees in the world.
Description
Bombus cockerelli is a typical bumblebee in appearance, with queens long, and distinctly smaller workers. The queens and workers are black on the head, with a few pale yellow hairs. The anterior and posterior thorax and the two basal and two terminal abdominal segments are yellow, while abdominal segments 3 and 4 are black. Males are unknown.Another species of bumblebee, Bombus balteatus, known to occur at high altitudes in Colorado, is similar to B. cockerelli, but B. cockerelli has a shorter head, numerous intermixed black hairs on the anterior thorax, and the abdominal apex is yellow rather than rust-tinted.