BOMB US DERHAMELLUS 189 



Sub-section II. Carder-bees. 



13. BOMBUS DERHAMELLUS, Kirby. 

 Red-shanked Carder-bee. 



Synonym : raiellus, Kirby. 



Queen. Small; length 16-18 mm., expanse 29- 

 32 mm. 



Black, with the three last segments of the abdomen red. 

 The red is not so bright as in lapidarius, and soon fades 

 to rust-yellow. Hairs of the corbicula red. 



Coat rather thin and uneven, not long. 



Worker. Length 10-16 mm. 



Resembles the queen except in size, but sometimes the 

 hairs of the corbicula are red only at the tips. 



Male. Length 13-14 mm., expanse 23-26 mm. 



Head black, more or less tinged with grey. Thorax 

 black, generally with a dusky yellowish-grey band in front and 

 another behind. Abdomen black, with the 4th and following 

 segments red, and generally with the 1st and 2nd segments 

 more or less dusky yellowish-grey. The red is less bright 

 than in lapidarius, Cf. the male of Psitliyrus rupestris. 



In some specimens the 2nd segment is bright yellow 

 or brownish -yellow. Sometimes the red spreads on to 

 the 3rd segment. 



Coat rather thin and uneven, not long. 



Antennae rather long ; length of flagellum 5 J mm. 



Each of the joints of the antennae, from the 6th to the 

 1 2th, slightly swelled behind. 



The antennae differ from those of sylvarum in having 

 the 3rd joint much longer than the 4th. 



Armature distinct, but approaching that of sylvarum. 



B. derhamellus is a widely-distributed species in 

 Great Britain and Ireland, and common in many 

 places, especially in the north of England. I have 



