284 CLAUDE FULLER. 



Minor Soldier. — The antennas are XVI- or XV- jointed 

 (fig. 11, i, J). The two forms having been found as companions 

 upon one insect, it is very clear that the XV is derived from 

 the XVI as the result of a (13-f 12) union. The shortness of 

 III indicates that one is ai'rested at stage H, the other at GH. 

 The flagellum is therefore one of 17 elements. 



Major Worker. — The antenna of the major worker are 

 usually XVII (fig. 11, h), but may occasionally be XVIII- 

 jointed (/, g). These organs seem to illustrate two stages of 

 development. The XVIII expressions represent stage K when 

 the flagellum is one of 19 elements. From the general 

 appearance of the XVII organs they seem to represent stage 

 Kb and are XVII by the abjunction of (14). Such antennte 

 would have the same elements in the flagellum but the forma- 

 tive not so developed. Alternatively IV may be a dwarfed 

 ( 1 5 -}- 1 4) compound . 



Minor Worker. — These organs count either XVII or 

 XVI. The XVII represents a development to stage Kb. The 

 XVI (fig. 11, k) is a development which ceases as between I 

 and J, and in both expressions the elements of the flagellum 

 may be regarded as 19. 



Antennal formulas : 



Imago : 

 XXI : 1 11 III (0000) IV (18) V (17) VI (16) 

 XX : I II III (0000 + 18) IV (17) V (16); fig. 11, a 



Major soldier : 

 XVIII : I II III (0000) IV (15) V (14) VI (13) VII (12) 



XVII : I II III (0000 + 17+ 16) IV (15+ 14) V (13) VI (12) 



Minor soldier : 

 XVI : I II III (0000) IV (13) V (12) 



XV : I II III (0000) IV (13 + 12) 



Major woi'ker : 

 XVIII : I II III (OOOO) IV (15) V(14) VI(13) VII(12) 



XVII: I II 111(0000+ 15) IV (14) V(13) VI (12) 



Minor worker : 

 XVII : I II III (0000 + 15) IV (14) V (13) VI (12) 



XVI : I II III (0000 + 15 + 14) IV (13) V (12) 



