DEVELOPMENT OF THE ANTENNiE OF TERMITES. 255 



suppressed, the joint may be simple in outline ; otherwise it 

 will be more or less bilocular. 



When the process is subsiding there is a marked tendency 

 in the first mode to change to the second, and tlius it fre- 

 quently happens that antenna) will be finally odd-jointed 



Text-pig. 4. 



Diagrams illustrating antennal development and joint multiplication. 



although originally progressing to an even total. This is due 

 to the fusing of the joint-elements and the disappearance of 

 the lines of fission, i. e. the series of elements is transformed 

 into a homogeneous column. 



There may, therefore, be two forms of compound joints in 

 the flagellum — those which result from the fusing of sister 

 elements and giving rise to compound joints removed more 



