282 CLAUDK FIFLLER. 



suppression of the articulation as between III and (11) is a 

 very common occurrence with termite antennee, and consti- 

 tutes the feature^ already alluded to, which transforms an 

 organ with a potential even number of joints into an odd- 

 jointed expression. The suppression of the articulation 

 between the non-sister joints (9) and (10) is an extraordinary 

 condition even as a result of dwarfing. From the internal 

 condition of the organ, represented b}^ fig. 10, i, it can be 

 seen that it is a potential XIV expression, or XIII, according 

 to whether both or one of the suppressed articulations have 

 developed sufficiently before the mutation occurred. Should 

 both develop, a XIY organ results in which III and IV are 

 about equal; if only that between (9) and (10), a XIII 

 organ in which III is decidedly longer than IV. Such XIII 

 and XIV organs characterise the nasuti belonging to more or 

 less juvenile communities, whilst the XIV and XV expres- 

 sions of populous and prosperous communities, in which III 

 is a longish joint, follow upon a greater degree of antenna! 

 development. In figs. 10, j, k, I, m, n, the homologies of the 

 main forms are indicated. Figs, j and h illustrate the XV 

 and XIV expressions of large-sized major nasuti. Figs. I 

 and m, the XIV and XIII of minor nasuti found in mature 

 colonies. Fig. n represents the Xll-jointed organ of nasuti 

 belonging to an incipient community. 



(7) Hhinotermes putorius Sjostedt. Fig. 11, a-lx. 



Antennal Index. — Imago XX (XXI) ; major worker XVIII, 

 XVII; minor w^orker XVI (XVII); major soldier XVIII, 

 XVII (XVI) ; minor soldier XVI, XV. 



The development of the antennas of this species has not 

 been extensively examined. The smallest larvae, probably of 

 the first instar, were ft)und to have organs in stage A 

 (PI. XV), while some larger individuals had organs in stage 

 D. The antennae of imago-nymphs of the fifth instar are of 

 XX or XXI joints ; in both forms III is an enlarged joint as 

 in fig. 11, and, in the XX expression, exhibits a distinct 

 annulation — a feature disappearing Avith chitinisation. 



