JOURNAXi OF ENTOMOLOGY AND ZOOLOGY 217 



13. The cells in the body ganglia are not at all periods closely 

 massed. It is possible to determine three main cell masses on each 

 side in certain stages, as well as some smaller unpaired areas, as 

 shown in Pig. 32. 



14. In the brain ganglion of an early stage it is possible to dis- 

 tinguish three main areas, counting the optic lobes and the eyes. 

 In the central of these three, on each side there is the ganglion of 

 the first antenna, and in addition four or more other marked areas 

 whose meaning is not yet determined. The more lateral parts 

 of the ganglion and optic lobe area have a large number of centers, 

 as shown in Fig. 31. 



15. At first the cells of the brain are much the same size, but in 

 stages when pigment begins to show in the eyes, small cell areas 

 may be found, as in Figs. 40, 41, and 45. 



16. At a time when the whole eye of the young is pigmented, 

 the brain and ganglia are much as in the adult, and fiber tracts are 

 evident. It is at such a time that the animal is able to move about 

 and run away; it is now from 3 to 4^^ mm. in length. 



