OBSERVATIONS ON SOME SOUTH AFRICAN TERMITES. 419' 



segments; major soldiers 17 and 16 segments, and the- 

 minor soldiers 17 segments. The XlX-jointed worker is rare,. 

 and the XYIIl-jointed is more common than the XVII-jointed 

 form, a circumstance which, in combination with other 

 features, illustrates that the worker-caste is due to arrested 

 development. 



Text-fig. 14. 



IV I V I VI I VII J VIII I IX 

 Imaffo •. X\X Jointed 



3*4 



Worker X\X Jointlo 

 5 6 7 S 9 10 



IV I V 1 VI I VII 



^' Worker XVIII Jointed. 

 i 

 5+-6 



^^y' Worker &< Soldier : XVII Jointlo. 

 5M^5-^6 7 8 9 10 II 



IV 



Soldier :)WI JoiNTtO. 



Diagrams of different antenna; of various castes of Termes 

 badius to illustrate liowtlie variations exhibited arise through 

 the moi'e ov less complete failure to separate of the segments 

 immediately distal to joint II. 



If the several forms of the worker antennte are compared^ 

 it is seen that the rare XlX-jointed form is very similar in its 

 pattern to the adult imago form ; the chief difference being 

 in the generally smaller size of the joints. This is illustrated 

 in the antennal curves to which reference will presently be 

 made. It is further illustrated in the accompanying diagrams. 

 Starting from the XlX-jointed form it is not difficult to show 

 how the XVIII-jointed form arises out of fusion (or, more 



