134 
Beekeeping 
entirely occupied by large muscles for the movement of the 
wings. The abdomen contains the greater part of the 
alimentary canal, the reproductive organs and large air 
sacs. It will of course be understood that the functions 
of these three main parts are not confined to those named. 
The tracheal sacs extend into the thorax and head, the 
nervous system extends along the central side of the thorax 
and abdomen. 
Head. 
On the head are located numerous sense organs, the dis¬ 
cussion of which is reserved for a later chapter. Aside 
Fia. 68. — Front ( A) and back (B) views of head of worker bee with 
the mouth parts cut off near their bases. 
from these, the most interesting features are the complex 
mouth parts. The general appearancfe of the head of a 
worker bee (with all the hairs removed) is shown in the 
accompanying figure (Fig. 68, A and B). It is roughly 
triangular with the apex below, where the mouth parts 
are situated. The sides are rounded out by the compound 
eyes ( E). From front to back, the head is flattened and 
