82 THE HONEY-BEE. 



Articulata, to which all true insects belong, is that of 

 a double cord, with knot-like protuberances, called 

 ganglia, at more or less regular intervals. The two 

 filaments are in some cases close together : in others, 

 quite distinct ; while the larger nerve-masses the 

 previously mentioned ganglia also vary in juxta- 

 position, according to the greater or less importance 



FIG. 23. NERVOUS SYSTEM OF LARVA OF BEE. 



of the functions they regulate. In the illustration of 

 the larva of Sphinx ligustri (the privet hawk- moth) 

 (Fig. 22), the nervous cord is nearly uniform through- 

 out its length, though at its upper portion a separation 

 takes place into three loops. The ganglia also occur 

 at almost equal distances. A very similar disposition 

 of the nerve-structure is seen in the larval condition 

 of the bee ; but we may note the absence of loops, the 

 larger development of the cephalic masses, without 



