252 CLAUDE FULLEK. 



of certain other organs, the internal is in advance of the 

 external. In other words, in a developing termite the appro- 

 priate jointing of the antenna for one or more succeeding" 

 stadiums becomes clearly marked out in the soft tissues long 

 before an inner noAv layer of chitin is j^roduced preparatory 

 to ecdysis. The external may first be discussed, and the 

 internal described in a later section dealing with the sub- 

 division of joint III. 



The new joints are at first indicated externally by annula- 

 tions. They then abjunct in a somewhat rudimentary form, 

 and, as they become larger and more decidedly articulated,, 

 slowly develop in character, whilst a whorl of long set^ 

 gradually grows from them ; later they become more haired, 

 and, in some cases, a second whorl of long seise grows. It 

 would appear that, once abjuncted, although a joint may 

 become quite attenuate, it never again sub-divides. 



In the abstract the process is simple, and may be said to 

 represent the insertioii of new joints between III and IV, or 

 the formation of joints at the expense of III as stated by 

 Midler and Sjostedt. Where this takes place the joints are 

 ordinarily added two by two, the distal being always larger 

 and in a more advanced condition than the proximal. In 

 some antennas the addition seems to be one by one, but this 

 is only because the proximal member of a pair is more 

 delayed in its development than is commonly the case. The 

 process in the antennse of Hodotermes is not readily 

 followed; it is somewhat exceptional, and is to be considered 

 as omitted from this general statement. 



(4) Joint III and its Subdivision. 



Joint III is a link between the flagellum and the scape, a 

 receptacle for joint elements, a womb wherein they undergo 

 a certain amount of development before being abjuncted as 

 rudimentary joints. Except in the antennae of Hodotermes, 

 and possibly other species with multi-jointed organs which 

 I have not examined, joint III elongates and subdivides- 



