vill BOMBOCS DERHAMELLUS 189 
SuB-SECTION I].—Carde7-dees. 
13. BOMBUS DERHAMELLUS, Kirby. 
Red-shanked Carder-bee. 
Synonym :—raiellus, Kirby. 
QUEEN.—Small; length 16-18 mm., expanse 29- 
Ae Naoko 
Black, with the three last segments of the abdomen red. 
The red is not so bright as in /apzdarius, 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 lst and 2nd segments 
more or less dusky yellowish-grey. The red is less bright 
than in /apidarius. Cf. the male of Pszthyrus 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. 
Antenne rather long; length of flagellum 53 mm. 
Each of the joints of the antenne, from the 6th to the 
12th, slightly swelled behind. 
The antenne differ from those of sy/varum in having 
the 3rd joint much longer than the 4th. 
Armature distinct, but approaching that of sy/varum. 
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 
