Bombus rupestris (Fabricius,1793)

Synonyms

Apis arenaria PANZER 1801; Apis frutetorum PANZER 1801; Apis albinella KIRBY 1802; Psithyrus frutetorum var. interruptus LEPELETIER 1832; Bombus obscurus SEIDL 1838

 
 
 

Description and notes

Until recently this species was known as Psithyrus rupestris but Psithyrus has now been reduced to a subgenus within Bombus. This is a large cuckoo-bee which is a social parasite on the common and widespread red-tailed bumble bee, Bombus lapidarius. Both species are all black with a red tail, but the female parasite has darker wings. Identification keys and general biology are found in Sladen (1912), Free & Butler (1959), Alford (1975) and Prŷs-Jones & Corbet (1991).

  • Photo by John Vallender
    Bombus rupestris female
  • Photo by Nick Owens
    Bombus rupestris female excavating hole, Cambridge, June 2011
  • Photo by Steven Falk
    Bombus rupestris pair copulating.
  • Photo by Steven Falk
    Bombus rupestris male - dark form. Hay Wood, Warwickshire
  • Photo by Steven Falk
    Bombus rupestris male. Ryton Wood, Warwickshire
  • Photo by Jeremy Early
    Female Bombus rupestris, Surrey
  • Photo by David W. Williams
    Bombus rupestris male showing extensive red tail, Long Mynd, Shrops, 03/07/2010
  • Photo by Nigel Jones
    Bombus rupestris female
  • Photo by Nick Owens
    Bombus rupestris female, Cambridge, August 2010
  • Photo by Steven Falk
    Bombus rupestris female. Sunrising, Warwickshire
  Pre 1980   1980-99   2000 and later

The following datasets are included:

  • Bees, Wasps and Ants Recording Society - Bees, Wasps and Ants Recording Society - Trial Dataset

Distribution

Widespread throughout the British Isles, particularly in southern England, this species declined considerably during and after the 1940s but has shown a remarkable resurgence in the past decade. The host is very widespread and appears to be currently increasing its range northward.

The species ranges from southern Fennoscandia south to the northern coast of the Mediterranean and Sicily, and eastwards to Siberia, Mongolia and northern Kazakhstan (Loken, 1984).

Status (in Britain only)

Listed as a Notable (B) species Falk (1991) [now known as Scarce (Nb)], but becoming more abundant.

Habitat

Although its host is a frequent species in gardens, most records relate to areas of unimproved grasslands

Flight period

The females do not usually come out of hibernation until late May or June and can be seen searching for host nests during the latter month. The new generation of adults emerges in late July or August

Pollen collected

As this bee is parasitic, it does not collect pollen. This task is carried out by the host workers.

Nesting biology

In early summer, each female Bombus rupestris enters an established nest of B. lapidarius where it attacks and kills the resident queen. The parasite then establishes itself as the "queen" in the nest with its complement of B. lapidarius workers. The female B. rupestris lays female, and then male eggs that will be reared by the B. lapidarius workers. Once egg laying is completed, the female B. rupestris dies in the nest.

Flowers visited

Mainly plants in the families Apiaceae, Lamiaceae and Asteraceae.

Parasites

None specifically recorded in Britain

Author of profile

M Edwards and E G Philp

Year profile last updated

Profile written: 2001

Proofed: February 2012