475 



The stomodaeum is discernible as a long narrow tube leading back 

 to the mesenteron and connecting with it at about the level of the 

 third thoracic segment. The connection is of the same valve-like 

 character as has been described for the similar stage in the embryo 

 of Caiiiponotits. The proctodaeum also is similar to that described 

 for the corresponding stage of Camponotus. There is a wide middle 

 part connected at one end by a short, narrow, tube-like part with the 

 anus and similarly, at the other end, with the posterior end of the 

 mesenteron. The connection between the proctodseum and the 

 mesenteron has not yet been established. The segmentation is es- 

 sentially as in the preceding stage; the last three abdominal ganglia 

 and the three ganglia composing the subcesophageal ganglion are 

 more closely united, however, and the supraoesophageal ganglion is 

 larger than in the preceding stage. 



