DEVELOPMENT OF THE ANTENNJ?: OF TERMITES. 285 



(8) Caloternies durbanensis Haviland. Fig. 12, a-h. 



Antennal Index. — Imago XIX to XV ; soldier XV to X. 



As indicated by the index tlie final antennas of this species 

 are an epitome of variation and of oddity. An examination 

 of nndifferentiated larvae and of later developing forms con- 

 veys the impression that the joints are abjuncted in the usual 

 manner. Those of the undifferentiated may be X, XI, XII, 

 and those of small forms with discernible wing-sacs may be 

 XII, XIV, XV. The largest nymphs usually exhibit antennae 

 of XVII, the common quota of the organs of the imago. 

 No XlX-jointed nymphs were found, and this is to be 

 attributed to the comparative rarity of final organs with so 

 many joints. The following table shows the variation for the 

 series examined : 



In all soldier antennae joint III is extraordinarily large and 

 clavate : it is such that it seems to foreshadow III of the 

 three-jointed scape of specialised insect-antennee. In some 

 of the XVI and XVII imago antennas III also tends to be 

 gross and clavate, but never so strikingly as is the case with 

 the soldier. 



Imago. — The imago antennas group themselves into two 

 series : (i) those that develop along the lines of stages A to 

 Nb, when (16) is abjuncted and they become XlX-jointed; 

 (ii) those suffering arrest, which, whilst it does not interfere 

 with the development of elements, does interfere with that of 



