THE SOLDIERLESS TERMITES OF AFRICA 57 



16 Posterior margin of head capsule usually evenly rounded, pilosity a short fine pelt 

 with emergent setae. Median suture of postclypeus usually weak, sometimes 

 absent. Transverse dark suture of mesonotum weak or absent, that of metanotum 

 weak. (Distribution, West Africa to Uganda, and Congo) . quietus (p. 91) 



- Posterior margin of head capsule usually unevenly rounded, pilosity usually uneven, 

 but occasionally approaching a pelt. Median suture of postclypeus distinct. 

 Transverse sutures of meso- and metanota distinct. (Distribution, S. Africa to 

 Angola) .......... brevior (p. 84) 



Workers 



Fore tibia with third apical spur vestigial, one-quarter or less length of other two 



(3rd spur sometimes hard to find) ......... 2 



Fore tibia with third apical spur not vestigial, more than one-quarter length of 



other two ............. 6 



Small, W, 0-65-0-66. Fore tibia more inflated Ti/T w , 4-22-4-34. Enteric valve 



seating dorsolateral, nearly dorsal, in unopened abdomen . benignus (p. 61) 



Larger, W, 0-85-1-08. Fore tibia less inflated, Tj/T w , 4-55-5-96. Enteric valve 



seating lateral in unopened abdomen ........ 3 



Apical teeth of mandibles longer, La/Li, 0-79; left mandible with proximal end 

 of subsidiary marginal tooth clear of molar prominence but not separated by 

 deep notch, La/Li. L m , 15-81. Postclypeus more inflated, Pcl/Ri, 305. Fore 

 tibia more inflated, Ti/T w , 455. Pilosity of head capsule pale, fine and incon- 

 spicuous. Junction between mesenteron and proctodeum nearly transverse; 

 enteric valve seat prominently bilobed, ventrolateral in unopened abdomen 

 (Text-figs 000 & 000) ........ mitis (p. 77) 



Apical teeth of mandibles shorter La/Li, 0-62-0-73; proximal end of subsidiary 

 marginal tooth separated by deep notch from molar prominence, La/Li. L m , 

 7-90-9-97. Postclypeus less inflated, Pcl/Ri, 2-39-2-63. Fore tibia less in- 

 flated, Ti/T w , 5-21-5-96. Pilosity of head capsule long, yellow to yellow-brown, 

 conspicuous. Mesenteric-proctodeal junction diagonal or longer, enteric valve 

 seat weakly bilobed, lateral .......... 4 



Right mandible with anterior edge of first marginal tooth shorter than anterior 



edge of second ......... murcus (p. 79) 



Right mandible with anterior edge of first marginal tooth slightly longer than 



anterior edge of second .......... 5 



Smaller, W, 0-85. Apical teeth of mandibles shorter, La/Li, 062 ignavus (p. 75) 



Larger, W, 1-08. Apical teeth of mandibles longer, L A /Li, 0-73 . irrixosus (p. 100) 



Enteric valve seating sessile on second pouch of proctodeum or at most with very 



short (length less than own width) neck ....... 7 



Enteric valve seating with a definite to very long (length equal to own least width 



or more) neck connecting it with second pouch of proctodeum . . . . 11 



Right mandible with anterior edge of first marginal tooth approximately equal 

 to anterior edge of second. Enteric valve seating with three prominent lobes, 

 inner almost equal to outer pair ..... empodius (p. 94) 



Right mandible with anterior edge of first marginal tooth definitely shorter than 

 anterior edge of second. Enteric valve seating weakly lobed, inner lobe where 

 present much smaller than outer pair ........ 8 



Small, W, 0-58-0-60. Proportions of mandibular teeth by complex ratios La/Li. L m , 

 14-80-18-60, Ra/Ri.Rih, 18-29-22-15. Fore tibia more inflated, Ti/T w , 3-90-4-07 



comis (p. 63) 



Larger, W, 0-70-0-93. Mandibular ratios, La/Li. L m , 7-25-12-41, Ra/Ri-Riti. 



9-94-14-10. Fore tibia less inflated, Ti/T m , 4-02-5-52 ..... 9 



