CONSTITUTION AND DEVELOPMENT OP TERMITES. 59 



is well developed, somewhat conical, and flattened at the tip. 

 The mentum is subtriangular, the submentum subquadran- 

 gular ; both are broader than long. 



The pronotum is narrower than the head^ subquadrate, and 

 deeply sulcale behind the anterior fourth, at right angles to a 

 shallow median sulcus which extends backwards to the base. 

 The intersegmental membrane between the pronotum and 

 raesonotum is well developed, pilose, and somewhat thickened, 

 except at the anterior and posterior margins. 



The mesonotum is broader than the pronotum, subquadrate 

 with rounded angles. The intersegmental membrane between 

 it and the metanotum is very similar to the previous one. 

 The metanotum is subrectangular, as wide as, but shorter than 

 the mesonotum, with rounded angles. 



The thoracic sterna exhibit various transverse and oblique 

 sulci. The mesosternum is longer than the prosternum, and 

 the limits between the metasternum and the first abdominal 

 segment are not clearly recognisable. 



The legs are long and robust, the middle pair being the 

 least developed. The respective pairs are equidistant from 

 each other, and arise from the hind part of their respective 

 segments ; -the insertions of the anterior and middle legs are 

 remote and almost lateral ; those of the hind legs are some- 

 what approximated. In all the coxa is very short and conical • 

 the trochanter is short, narrow, and subcylindrical, and the 

 femur laterally compressed. 



The anterior femur, tibia, and first tarsal joint are of nearly 

 equal length. The latter joint (PI. 19, fig. 9) is enlarged, 

 and possesses a curved sulcus running from the middle to the 

 apex of its upper surface; below it is furnished with a 

 very large number of small spines, and a smaller 

 number of setae, tubular and slightly curved at the 

 tip, which sometimes exhibits a minute drop of trans- 

 parent secretion. The second and third tarsal joints are 

 comparatively small ; the former is widened and subtriangular, 

 the latter narrow, cylindrical, and inserted on the upper side 

 of the second towards its apex. The second is armed below 



