294 CLAUDE FULLER. 



and in some exhibits a faint pseudo-articulation. It is reg"ar(1ed 

 as a regular development to stage H. The nymph of the 

 lastinstar also has XVI-jointed antennte {h). All the worker 

 antennee may be classed as regular developments to stage E 

 or to I, with an occasional tendency to pass through J to Kb 

 and so become XVII (fig. 14, c-e). 



With reference to the asymmetry in the pairs of soldier 

 antenna, the most extraordinaiy seen is that represented by 

 fig. 14, S-.9.S-. The X-jointed expression is aberrant ; it is not 

 aborted, but an organ in which joint-multiplication has 

 subsided when in stage A. It is one of X joints, but with 

 a flagellum of quite 13 elements. Its XIV companion may 

 only be regarded as one that developed either to the stage F 

 or G with a flagellum of 17 elements. If it could be shown 

 conclusively that the multiplication of joints in the termite 

 antenna was correlated with the development of the organs 

 of reproduction, the asymmetry of these soldier antennas 

 might be traced to an asymmetrical degeneration and atrophy 

 of the organs of sex — i. e. asymmetrical castration. 



(11) Cubitermes (bilobatus group). 



Antennal Index. — Imago XVI, XV ; worker XV, XIV : 

 soldier XV, XIV. 



The antennae of the three castes are the outcome of a very 

 short course of joint-multiplication. The smallest undifferen- 

 tiated forms exhibit the pseudo-XII expression (stage A), in 

 which the flagellum is composed of 13 elements. The XIV- 

 jointed worker and soldier antennge are both developments 

 to the stage F. The XV organs, in which III, IV and V 

 are subequal, are arrived at by the subdivision of III, 

 (12) being abjuncted. The XV antenna of the imago 

 and some workers, in which III is small and IV rela- 

 tively large as compared to either III or V, represents a 

 developnieut to stage GH, the coarse IV being a (13 + 12) 

 combination. 



