Anatomy of Bee's Sting. 133 
lancets (Fig. 51, 7, 7) or through the central tubes (Fig. 
51, VV), between the three spears. 
The lancets are held to the central piece by projections 
(Fig. 51. Z, 7) from the latter, which fit into correspond- 
ing grooves (Fig. 51, 7’) of the lancets. In the figure 
the lancets are moved one side to show the barbs and valves; . 
normally they are held close together, and thus form the 
tube (Fig. 51, V). 
At the base of the central awl two flexible arms (Fig. 
52, 6 2) run out and up, where they articulate with 
Fic. 52. 
Sting of Worker Bee, modified from Hyatt and Bryant, 
strong levers (Fig. 52, D, D). The two lancets are sim- 
ularly curved and closely joined to the flexible arms by the 
same dove-tailed groove and projection already described. 
These lancets connect at their ends (Fig. 52, ¢,¢) with 
heavy triangular levers (Fig. 52, B, &), and these in turn 
with both C and Datj ands. All of these levers, which 
also serve as fulcra (Fig. 52, 4, C and D), are very broad 
and so give great space for muscular attachment (Fig. 52, 
mm). These muscles, by action, serve to compress the’ 
poison sac, also cause the lever (Fig. 52, 2) to rotate about 
