272 



CLAUDE FULLER. 



conventional V with VI or III with lY of the XIX expres- 

 sion. The different forms are represented in fig. 7, b-Ji. 

 The clue to the origin of the XVII-jointed organ (h) is given 

 by (d) ; this counts XYII-joints, but both III and IV are 

 decidedly compound and exhibit well-defined pseudo-articula- 

 lations. In this expression III represents (III + IV) and IV 

 represents (V + VI) of the XlX-jointed expression. In (//) 

 the evidence of the fusion is lost. Other forms (e and/) are 

 XVIII-jointed because only the conventional V and VI of 



Text-fig. 7. 



Termes bellicosus Smeafh. a. Imago, b-h. Soldier. 



the XIX have fused; in one type (e) the compound uature of 

 the joint is indicated by a notch and a decided pseudo- 

 articulation, in the other (/) only by the length of the joint. 

 The form {g) may be described as intermediate to an XVII [ 

 and a XVII expression. A few other minor variations also 

 occurred in this series of antennas, but all of a confirmatory 

 nature. 



Development. — The development of these antenna? is 

 parallel with that of those of Termes natal en sis and all 

 are treated as homologous with the XIX (pseudo-XX) imago 

 organ, represented by fig. 7, a. To attain this expression the 

 organ develops from stage C to Nb through M and is XIX- 



