Bombus ruderatus Fabricius, 1775

Bombs ruderatus is a large size bumblebee (length in queens: 21-24 mm, length in males: 15-17 mm).

It has a very long head, due to its large malar gap, also its labrum's groove is wide and deep. The clypeus is heavily spotted, and the forehead has a thin and regular stipple. The hind legs present a reticulated tibia. Females with genitalia quite similar to Bombus hortorum.
Males present a longer antenna, hind legs with flattened and thin reticulated tibia, with chaeta, whose length is sizeable. Males present genitalia similar to Bombus hortorum, generally very big.
The colour pattern depends on subspecies, but generally black and yellow stripes, with the last stripes white.