Barbut’s cuckoo bumblebee (Bombus barbutellus)

Barbut's cuckoo bumblebee

Barbut’s cuckoo bumblebee (Bombus barbutellus). Photo credit: Mark Hows.

Species distribution map from https://nbnatlas.org
Red: records 2000-present. Yellow: pre-2000 records.*

A large cuckoo species which parasitizes the nests of the Garden bumblebee (Bombus hortorum), and probably also those of the Ruderal bumblebee (Bombus ruderatus). Like all cuckoo bumblebees, this species does not collect pollen to feed offspring, and correspondingly neither sex has pollen baskets and there is no worker caste. It is found across the UK, though its northern distribution is largely coastal and it is only truly widespread in the south. Like the hosts, this species has a yellow-black-yellow thorax and the first abdominal segment is yellow (sometimes faintly so in females), with a black band between that and the grey-white tail.

Barbut’s cuckoo bumblebees. Photo credit: Marian Bryce.

Similar in appearance to the host species, the Garden and Ruderal bumblebees, but distinguished from them by having a much shorter face, only around as long as it is wide. The Heath bumblebee (Bombus jonellus) is also similar, but males have yellow faces (dark in the Barbut’s cuckoo) and queens and workers have pollen baskets, unlike the cuckoo.

For more photos visit: https://www.flickr.com/photos/63075200@N07/sets/72157631409268642/
For more detailed information visit: http://www.bwars.com/index.php?q=bee/apidae/bombus-barbutellus

* This map displays the data currently publically available on the NBN Atlas website at http://www.nbnatlas.org. Data have been contributed by a range of organisations: see here for the full list.  Please note that records from the national recording body (BWARS) are not yet available on the NBN so this map may appear incomplete.

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