286 



CLAUDE FULLER. 



articulations, so that the elements fuse and a longer or shorter 

 joint forms about different totals of elements. 



A pair of antennae is illustrated by fig. 12, a-aa, of which 

 one is XVIII-jointed, and the other, owing to a (15 + 14) 

 union, XYII-jointed. Another pair is illustrated by {h-hh), 

 one of which is normally XVII, whilst the other is XV-jointed ; 

 as between these two organs a considerable disparity will be 

 noticed in joint III. 



With a view to ascertaining whether any relationship 

 existed between the length of III and the supposed number of 



Text-fig. 12. 



^ h 



Calotermes durbanensis Haviland. a, b. Imago, c-g. Soldier. 

 h. In second instar. 



joint-elements it comprised the basal joints in the flagellum 

 of four antennae were measured. The results are shown in the 

 following table, the length units being micro-ocular divisions. 

 The proportions are seen to be peculiarly i-egular, especially 

 the 10, 14, 18 series. That III in the XIX expression is 

 slightly out of proportion is due to the condition of the 

 elements it represents. 



