48 Claude Fuller 



There is more superficial regularity with the left mandible, but 

 here also an extra tooth often occurs at half the length of the 

 apical point. Leaving this out of consideration, left mandibles 

 that are more or less regularly serrate usually exhibit 7, 8 or 9 

 teeth; the more inferior of the series may be rounded knobs and 

 not triangular. Exceptional left mandibles are also to be met 

 vsdth which exhibit only 3 or 4 teeth. 



(d) Throughout the series the pro-, meso- and metanota of the 

 soldier are subject to slight variations of contour. With the pro- 

 notum the sides of some tend to be more oblique than of others, 

 and to vary from being straight to faintly curvate or incurvate. 

 The front margin is always decidedly, angularly indented, but in 

 the larger soldiers the two margins meeting at the median notch 

 are more arcuate than in the case with smaller soldiers. The hind 

 margin is always faintly incurvate. The mesonotum is relatively 

 large and usually rounded behind, the metanotum is usually shorter 

 and has a more or less roundly truncate hind margin. 



The head of every soldier exhibits a dorsal fuscous band ex- 

 tending forward to and widest at the clypeal suture, where it ter- 

 minates. This has the appearance of being the visible sign of a 

 duct below the cuticle. However, there is never a superficial 

 groove upon the frontal area. 



(e) The clypeus of the soldier is short and incrassate, the an- 

 terior margin broadly curvate; it can be described as a weal-like 

 elevation with distinct hollows on each side. 



(f) With the largest soldiers the labrum is decidedly inflated 

 and darker than the head (somewhat alizarine) except that the 

 pointed extension is white, and that this colour narrowly margins 

 the tapering edges of the inflated part. With large and small 

 soldiers the labrum narrows toward its base. 



(g) With all soldiers the fontanelle is more or less distinct 

 and has fuscous edges 



(h) The soldier antennae range from X to XVI joints; very 

 rarely are those of the smallest soldiers clearly moniliform. 



(i) With the largest soldiers the head is plainly depressed in 

 the middle. 



