64 Muscles and Nerves. 
uted, though, as we should expect, they are concentrated 
in the thorax and head. In insects of swiftest flight, like 
Fic. 16. 
Nervous System of Drone after Duncan, 
the bee, the thorax (Fig. 15) is almost entirely composed 
of muscles; the esophagus, which carries the food to the 
stomach, being very small. At the base of the jaws (Fig. 
39) the muscles are large and firm. The number of mus- 
cles is astounding. Lyonnet counted over 3,000 in a single 
