200 Journal of Comparative Neurology. 



relationships seem to be the same as in the bee, in which I find 

 no evidence of crossing. 



X. Immediately behind the latter group is another com- 

 posed of cells of the same large size, the fibers of which pass 

 backward over the central body and connect it with the fibrillar 

 arch (fiber 2). 



XI. Considering the posterior region of the brain there 

 may first be noted a small group situated below the outer calyx 

 at a point where the outer antenno-cerebral tract reaches the 



. dorsal surface of the fibrillar substance. Its processes pass 

 downwards into conjunction with the tract and might be taken 

 for its processes of origin were it not for the fact that bichro- 

 mate of silver preparations show that its cells are situated in the 

 antennal lobe. Where the fibers of this group go to I have not 

 been able to determine. 



XII. Behind the stalks of the mushroom bodies is a small 

 group of large cells whose processes pass between the stalks to 

 the anterior root (fiber 7) giving rise to some of the association 

 fibers in that structure. 



XIII. Behind the inner stalk there is a group of medium 

 sized cells whose processes pass inward behind the inner anten- 

 no-cerebral tract and behind the central body into which each 

 fiber sends several branches (fiber 5). 



XIV. Behind the lateral margin of the central body and 

 beneath the fibrillar arch is a companion group whose fibers 

 pass directly forward and turning about in front of the inner 

 anteno-cerebral tract pass behind and send branches into the 

 central body (fiber 6). The two groups thus form a commis- 

 sure behind this structure. As before mentioned it is possible 

 that their neurites may be the fibers seen leaving the central 

 body and passing into the lower lateral portions of the proto- 

 cerebron and towards the commissural region (fig. 5). 



XV. Above these groups and between the central body 

 and the fibrillar arch and below the latter is a small group 

 whose processes form a bundle (figs. 2, 5, 6, 8) passing just in- 

 side of the inner antenno-cerebral tract over the top of the 



