340 



ERNEST WAIiREN. 



there are 8 abdominal ganglia, and from the arrangement of 

 the cortex in the fused abdominal mass it would seem that it 

 consists of the remnant of some 7 or 8 ganglia (PI. XVII, 

 tig. 43). The posterior end of the mass reaches the plane of 

 the middle of the coxa of the last pair of legs, and it tapers 

 only slightly (PI. XYIII). Laterally the mass gives off a few 

 very fine nerves, but no large nerves, comparable to those 

 supplying the legs, spring from it. 



The central nervous system of Ter mi to mini us is es- 

 sentially similar. The procerebral lobes are relatively longer 

 in the antero-posterior axis. The tritocerebrum is not so 



Termitodisciis splendidens Was)ii. Longitudinal vertical 

 section showing semi-moniliform condition of abdominal gan- 

 glionic mass which extends to tlie middle of the third abdominal 

 sternite. Lettering as in plates, x 140. 



distinctly marked off from the procerebral lobes as in Para- 

 corotoca. The prothoracic ganglion is separated from the 

 suboesophageal ganglion by a considerable length of double 

 cord. The abdominal ganglionic mass is relatively longer 

 than in Paracorotoca (PI. XV^II, of. figs. 43 and 44). 



In Termitodiscus, which is a wide, flat form of termito- 

 philous Aleocharine without inversion of abdomen, the central 

 nervous system also shows much modification, but it differs 

 considerably from that of Termitomimus and Paracoro- 

 toca. The prothoracic ganglion is in close contact with 

 the subfESophageal (text-fig. 4). There is a moderate!}'' lono* 

 connective between the prothoracic and mesothoracic ganglia. 



