OBSEKVATIONS ON 80ME SOUTH AFKICAN TERMITES. 421 



one stage, involves the separation of lit into two instead of 

 three segments. Consequently the final condition of III 

 varies according to whether the final IV is completely 

 articulated or not. If no complete fissure occurs the XA^I- 

 jointed antenna results. On occasion, too, the most recently 

 formed segments, i.e. Y and VI, appear to fuse instead of 

 becoming definitely separated, and this circumstance, together 

 Avith the compound nature of III, results in the XVII-jointed 



Text-fig. 15. 



T. badiiis; auteiina; of larva?, a. X-joiiited expression with a 

 loug joint III. b. The X-jointed changed to a Xll-jointed 

 expression by the subdivision of III. c. The Xll-jointed 

 expression prior to the subdivision of the long joint III to give 

 the XlV-jointed expression, d. The XlV-jointed expression 

 before the enlargement of III. 



form. The XVI-segniented type is obtained by an arrest of 

 development which must be considered to involve III as 

 comprising what would really have been III, IV, V, and VI 

 of the XlX-jointed type. 



In short, the XlX-jointed antenna is produced from a form 

 with fourteen segments by a process of proliferation or fission 

 in joint III. 



Apart from this process other factors seem to come into 

 play to influence the form ot certain joints. In badius 

 joint V is a relatively small joint in the XlX-jointed antenna 



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