48 



W. A. SANDS 



apical and second marginal teeth. Meso- and metanota fairly wide at constriction, M/W, 

 0-25-0-28, transverse dark sutures distinct, usually sharp and clear, sometimes more diffuse. 



Worker. Medium-sized, W, 0-74-0-79. Fore tibia slender, Ti/T w , 6-14-6-43, with three 

 apical spurs, but third vestigial, almost lost in most specimens. Apical teeth of mandibles short, 

 La/Li, 0-41-0-51, Ra/Ri, 0-53-0-66; subsidiary marginal tooth of left mandible with proximal 

 end hidden behind molar prominence in surface view, complex ratio La/Li. L m , 8-60-9-40. 

 Right mandible with anterior edge of first marginal tooth distinctly shorter than that of second, 

 complex ratio R A /Ri.R m . 10-59-11-20. Mesenteric overlap at junction with proctodeum 

 about twice as long as width of mesenteron at insertion of malpighian tubules, reaching half 

 way through malpighian knot. Enteric valve seating weakly two-lobed, connected to second 

 pouch of proctodeum by a short neck, lateral in position in unopened abdomen ; internal cushions 

 of enteric valve all more or less equally developed and- armed distally with prominent stout 

 spines protruding through valve opening. 



The single species of Amalotermes presents an unusual mosaic of characters, some 

 regarded as primitive, others as specialized, which makes it impossible to fit it into 

 a genus with any other known species. This conclusion, reached by conventional 

 means, is confirmed by its position in the various multivariate analyses. In both 

 single linkage and median clustering methods of examining the similarity matrix 

 it is in the last three species to be grouped, and this isolation is confirmed by the 



Figs 43-53. Amalotermes phaeocephalns . 43, 44, front and side views of imago head 

 capsule; 45, 46, imago mandibles; 47-49, worker ditto; 50, mesenteric-proctodeal 

 junction showing attachment of malpighian tubules and position of malpighian knot; 

 51-53, views of enteric valve seating. 



