II EPPE-HistTORY OF BOJBUS 21 
In the hind-legs, the next joint below the tibia, 
called the metatarsus, is enlarged into a sub- 
rectangular plate, which is densely clothed on the 



corbrcula 
receiver 
comb 
auricle 
RAN 
NEY RN 
NRAS brush 
MEN on metabarsus 4 
be ee 
i aN uae * ae N 
AN ANY Tues: 
AY ity tt WN Nahi Ww 
oo aN 
NICD tY) Vers 
iH a 

Fic. 5.—Pollen-collecting apparatus in Queen and Worker Humble-bee. 
A. Hind legs of Bombus terrestris queen. 
B. End view of apex of tibia, showing arch of hairs covering entrance to 
corbicula. 7, receiver; s, juncture of metatarsus with tibia (this is a ball-and- 
socket joint, the socket being here shown). 
C. Diagrammatic section of receiver and auricle, showing method of working. 
¢, comb ; *, receiver; a, auricle. 
inner side with stiff bristles forming a brush. In a 
pollen-collecting honey-bee this brush is filled with 
moistened pollen, which is evidently on its way to 
the corbicula. Cheshire states that the metatarsal 
