252 Annals Entomological Society of America [Vol. IV, 



The more median ventral mass of epithelial-like cells lying 

 ventral to and slightly out from the spherical fibrous area 

 probably has connections with the larger more dorsal cells. 



The more dorsal of epithelial- like cells which are one side 

 of a small cavity, send fibers into the lateral optic "punktsub- 

 stanz" and are connected by fibers with the more central dorsal 

 cells which adjoin it. 



(4) The Crura cerebri. The main mass of fibers goes up to 

 the central portion of the "punktsubstanz" on each side and 

 receives branches from all parts of it and also especially from 

 the median and lateral dorsal cell groups and probably also 

 from lateral masses. A large part of the band runs ventrally 

 and forms or is joined into a commissure with fibers from the 

 other side. Fibers come into this last from all ventral parts of 

 the ganglion from both directions, from ventral parts of the 

 mushroom bodies, and from various lobes of the deep staining 

 mass of the ganglion. 



(5) Commissures. Two commissures have been mentioned, 

 a ventral which was described above. The other more medial 

 is found toward the caudal region. It is short and broad. 



SUMMARY. 



1. In the abdominal ganglia practically all the nerve trunks 

 and branches are mixed motor and sensory. 



In the thoracic ganglia, the three main trunks are mixed. 

 Pure sensory divisions were found in connection with cephalic 

 branches. The branches given off between the thoracic gan- 

 glia and between the 1st thoracic and the subespohageal seem 

 to be motor. At least the more caudal ones were determined 

 to be, with fibers ascending and descending from the ganglia 

 below and above. 



The three large nerve trunks connected with the subeso- 

 phageal ganglion seem to' be mixed motor and sensory. The 

 other smaller ones were not determined, but the small gustatory 

 nerves were motor at least. 



The three main trunks connected with the supraesophageal 

 ganglion were all mixed but the ocular. 



2. Sensory tracts were recognized entering thoracic and 

 abdominal ganglia and distributed to various parts of the gan- 

 glion to which they were connected. That is distributed to 

 one or both sides either as individual fibers or as branches from 



