Bombus lucorum
The White Tailed Bumble bee

White-tailed bumble bee on Eryngium.White-tailed bumble bee on Eryngium.


Bombus lucorum, the white-tailed bumblebee, is one of the more common species of bumble bee found in Britain, and one of the most widespread.  It’s also one of the first to emerge from hibernation, and so is a species I anxiously look out for in the early spring.

Identification

White-tailed bumble bee - Bombus lucorum - male.White-tailed bumble bee - Bombus lucorum - male.



Queens are large (18 – 22 mm) although usually a little smaller than Bombus terrestris.

Bombus lucorum can sometimes be confused with Bombus terrestris at first glance.  The latter usually has a cream/off-white tinge to the tail, and whilst workers can have white tails, there will often be a very faint yellow band where it meets the black segment on the abdomen.  

White-tailed bumble bee - Bombus lucorum on Campanula flowers.White-tailed bumble bee - Bombus lucorum on Campanula flowers.

Worker white tailed bumble bees often have additional fine yellow bands on the thorax and abdomen, and males have yellow hairs on the face.  There are a number of variations seen within sub-species: Bombus magnus and Bombus cryptarum and here, distinguishing between B. terrestris may be even more difficult due to the white tails sometimes appearing to be tinged brown or yellowish in colour.



Bombus Lucorum
Lifecycle And Nesting

White-tailed bumble bee - Bombus lucorum on white byrony.White-tailed bumble bee - Bombus lucorum on white byrony.



Queens may emerge as early as February, and once they have replenished their reserves by foraging on flowers such as crocus, winter heathers, mahonia, white and red deadnettles, prunus, flowering currant and bluebells, you may see them flying close to the ground, investigating holes, crevices, dips and tussocks, as they seek a suitable place to nest. 

White-tailed bumble bee - Bombus lucorum on mallow.White-tailed bumble bee - Bombus lucorum on mallow.


Once queens are seen with pollen loads on their hindlegs (in the corbicula) then this can be taken as a signal that the queen has already established a nest.  Mouseholes and other abandoned underground nests of small mammals, are favoured. 


Workers may appear from late March to mid-May, depending on location and conditions. Some colonies produce males early in the season, some later, but males and daughter queens may be seen from late May to June onwards. 

Colonies can reach as many as 400 workers.  Second broods may be produced in the southern parts of Britain, depending on weather conditions, meaning this species may be seen as late as October in some areas.  However, in some years, they have even been seen through winter, foraging in parks and gardens in southern England.



Foraging Preferences

White-tailed bumble bee - Bombus lucorum on sedum.White-tailed bumble bee - Bombus lucorum on sedum.



In addition to the plants mentioned above, Bombus lucorum forage on ceanothus, wall flower, lavender, campanula, hebe, privet, sage, Hypericum, bramble, red bartsia, clovers, lupins, honeysuckle, sedum, knapweed, Buddleia, thistles, viper’s bugloss, vetches and trefoils, and comfrey among others.


They have short tongues, and can sometimes be caught nectar robbing.





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