268 CLAUDE FULLER. 



either one or of two articulations. The variations met with 

 are represented by fig. 6, h-e, and these are homologised 

 with an imaginary XX-jointed expression (a) derived from 

 the condition of (h) and (c). The antenna (6) would be 

 XX-jointed but for the capricious (13 + 12) combination, 

 and the antennao (c) and [d) would be equally so but for 

 the (III + 17) union. The antenna (e) passes as one of 

 XVIII joints, as it has two unions — (III + 17) and (11 + 



10). ■ 



Major Worker Antenna. — The antennae of the major 

 worker are, on the other hand, remarkably regular both in 

 the number of joints and in general pattern. I have always 

 found them characterised by a peculiar buffer-shaped III 

 and a very coarse VI, with a series of attenuate joints distal 

 to VI ; at least this was the case with those of over one 

 hundred individuals examined. 



One of the objects of this extended examination was to 

 ascertain if a pseudo-articulation was ever present in III or 

 in VI which would demonstrate their suspected compound 

 condition. The search was unavailing, but resulted in finding 

 five antenna in which joint VII exhibited a pseudo-articulation. 

 In examining developing antenme, however, it was quite an 

 easy matter to demonstrate III and VI to be compound, 

 although no evidence was obtained to show VII the same. 

 These few examples, in which VII appeared compound in 

 the adult, may represent atavism and indicate that the joint 

 ■was evolved from a union of two elements. If this is a correct 

 inference it can be shown that VIII is also similarly evolved. 

 Nevertheless, the joint is treated as simple in this discussion 

 because it develops apparently as a simple joint. By accept- 

 ing joints VI and III as compound the notation of the worker 

 antenna is as in fig. 6, k, VI being accepted as a (15 + 14) 

 union. 



Major Soldier ANXENNiE. — Between the antennae of the 

 imago and major soldier there exists certain superficial 

 resemblances. These latter organs can be homologised 

 among themselves (fig. 6, f-j), but the unions are not those 



