8i 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 



