Bombus lucorum –
The White-Tailed Bumble bee

Updated: 11th February 2021

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.  New queens among the first to emerge following their winter snooze, and so this is a species I anxiously look out for in the early spring.

Identifying Bombus lucorum

Queens are large (18 – 22 mm) although usually a little smaller than the buff-tailed bumble bee, 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.  

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 (northern white-tailed bumble bee) and Bombus cryptarum (cryptic bumble bee), such that distinguishing between B. terrestris may be even more difficult due to the white tails sometimes appearing to be tinged brown or yellowish in colour¹.

Bombus lucorum Lifecycle And Nesting

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

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 middle of 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

In addition to the plants mentioned above, Bombus lucorum forage on a wide range or flowers, shrubs and trees, including:

Garden shrubs and herbs:  Ceanothus, Buddleia, hebe, jasmine, privet, lavender, Hypericum, honeysuckle and many more.

Garden flowers and herbs:  wall flower, Campanula, sage, lupins, sedum, sunflowers, cosmos, coneflower, oregano, chives and a wide variety of other plants.

Wild flowers and shrubs:  bramble, red bartsia, clovers, knapweed,  thistles, viper’s bugloss, vetches and trefoils, comfrey among others.

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

Reference

1. Bertsch, Andreas & Schweer, Horst & Titze, Andreas. (2004). Discrimination of the bumblebee species Bombus lucorum, B. cryptarum and B. magnus by morphological characters and male labial gland secretions (Hymenoptera: Apidae). Beiträge zur Entomologie. 54. 365-386. 10.21248/contrib.entomol.54.2.365-386.

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