THE SOLDIERLESS TERMITES OF AFRICA 43 



Workers 



Mixed segment of gut long, anterior termination of proctodeal overlap distinctly 

 to left side of malpighian knot in ventral view (Text-figs 520-532, 585-603, 621- 

 627 & 648-658) 2 



Mixed segment of gut short, anterior end of proctodeal overlap on right side of 

 malpighian knot or at most within it in ventral view, or junction between 

 mesenteron and proctodeum transverse, without overlap, mixed segment absent . 4 



Mesenteron with spherical or hemispherical dilation at posterior end of mixed seg- 

 ment. Fore tibia moderately to strongly inflated, Ti/T w , 3-08-400, with only 

 two apical spurs. Enteric valve without armature, surface of cushions reticulated, 

 sometimes scaly at anterior ends .... ADAIPHROTERMES (p. 229) 



Mesenteron not distinctly dilated at posterior end of mixed segment. Fore tibia not 

 or moderately inflated, Ti/T w , 3-58-5-31, with three apical spurs. Enteric valve 

 cushions with scaly surface, or armed with spines or spicules, sometimes pro- 

 truding through valve opening at posterior ends (Plates 7, 8 & 9, excl. figs 10-12) . 3 



Enteric valve seating fully mid-dorsal in position in unopened abdomen (Text-fig. 6) 

 with three equal and conspicuous lobes. Cushions of valve all equally developed, 

 thickly armed at posterior ends with elongated spicules or protruding through 

 valve opening as transparent flattened vanes. Larger, \V, 0-90-1-00; complex 

 ratio Lm/Tw.LA, 3-23-4-83 ADERITOTERMES (p. 222) 



Enteric valve seating lateral or dorso-lateral in position in unopened abdomen, 

 with two or three weak lobes. Cushions of valve not equally developed, positions 

 3 and 4 larger, sometimes protruding through valve opening, armature when 

 present spiny, not spicules. Smaller, \V, 0-56-0-84; complex ratio Lm/Tw-LA, 

 5-01-7-85 ANENTEOTERMES (p. 192) 



Enteric valve cushions armed posteriorly with conspicuous spines or spicules 



protruding through valve opening ........ 5 



Enteric valve cushions unarmed posteriorly, or with minute spines or spicules not 



protruding through valve opening . . . . . . . . 10 



Armature of enteric valve more or less radially symmetrical with all cushions 



nearly equally developed .......... 6 



Armature of enteric valve asymmetrical with one or two cushion positions much 



more developed than the rest ......... 8 



Head capsule brown. Left mandible with proximal end jf subsidiary marginal 

 tooth hidden behind molar prominence in surface view. Third spur of fore tibia 

 vestigial. Overlap between mesenteron and proctodeum diagonal. Armature 

 of enteric valve of short stout spines on posterior ends of cushions only (PI. 1) 



AMALOTERMES (p. 47) 



Head capsule yellow. Left mandible with proximal end of subsidiary marginal 

 tooth not hidden behind molar prominence. Third spur of fore tibia distinct. 

 Junction between mesenteron and proctodeum nearly transverse, no appreciable 

 overlap. Armature of enteric valve of long thin spines or spicules extending from 

 about half length of cushions to distal ends ....... 7 



Smaller, W, 0-58. Apical teeth of mandibles shorter, La/Li, 052. Postclypeus less 

 inflated, Pcl/Ri, i-8o. Enteric valve seating with very short neck, weakly 2- 01 

 3-lobed. Armature of enteric valve arranged in rather regular transverse rows, 

 subsidiary spines below distal fringe slightly spatulate at tips (PI. 4) 



APAGOTERMES (p. 155) 



Larger, W, 0-76. Apical teeth of mandibles longer, L A /Lj, 1-09. Postclypeus 

 more inflated, Pcl/Rj, 3-28. Enteric valve seating with very long neck, definitely 

 3-lobed. Armature of enteric valve not regularly arranged, all spines thin and 

 evenly tapered (PI. 3) AMICOTERMES (p. 152) 



