THE SOLDIERLESS TERMITES OF AFRICA 143 



2 Smaller, W, 0-70. Apical teeth of mandibles shorter, L A /Li, 0-89, Ra/Ri, i-ii. En- 



teric valve-seating dorso-lateral, near dorsal, in unopened abdomen . chirotus (p. 143) 



- Larger, W, 080. Apical teeth of mandibles longer, La/L-, 1-00-107. Ra/Ri, 



1-18-1-29. Enteric valve-seating lateral in unopened abdomen .... 3 



3 Postclypeus more strongly inflated, Pcl/W, 0-33. Fore tibia less swollen, Tj/T w , 



427 ............ imbellis (p. 148) 



- Postclypeus less inflated, Pcl/W, 0-28. Fore tibia slightly thicker, Ti/T w , 3-92 



tithasus (p. i4<») 



Acholotermes chirotus sp. n. 



(Text-figs 340, 341, 348, 349 & 356-361; PI. 3, figs i& 2) 



Imago. Head capsule sepia-brown, darker above ocelli; fontanelle very small, less than one- 

 quarter size of ocellus, nearly flat, circular or short oval, pale brown; medial spot same size and 

 shape as fontanelle, colour as head; postclypeus brown, labrum pale yellow-brown; frontal 

 marks sepia-brown flat crescents; antennae yellow-brown. Pronotum, meso- and metanota, 

 brown, transverse dark sutures present but weak on mesonotum; femora pale yellow brown, 

 tibiae and tarsi yellow. Abdominal tergites brown, dorsal stigmata sepia-brown, sternites 

 yellow-brown, yellow in middle, ventral stigmata brown; cerci yellow. 



Posterior margin of head capsule widely and evenly rounded; ocelli fairly large, separated 

 from compound eyes by only about half own least diameter; postclypeus moderately inflated, 

 Pcl/W, 0-25-0-27, posterior margin bowed, not evenly rounded, median suture distinct. Apical 

 teeth of mandibles rather long, La/Li, 0-72-0-82, R A /Ri, 1-05; subsidiary marginal tooth of 

 left mandible just clear of molar prominence in surface view, complex ratio La/Li. L m , 12-88- 

 14-20; point of first marginal tooth of right mandible slightly behind line of apical to second 

 marginal, anterior edge of first marginal approximately equal, to that of second. Pilosity 

 of head capsule sepia-brown, uneven, not forming a pelt. Meso- and metanota fairly wide 

 at constriction, M/W, 0-30. Fore tibia with third apical spur distinct, about one-third length 

 of other two. 



Measurements (two specimens from one locality) in millimetres. 



Head width across eyes (W) 



0-84-0-90 



Ocellus (O w xOi) . 



007 x o-io-o-ir 



Ocellus to eye (O-E) 



003 



Postclypeus length (Pel) 



0-21-0-24 



Antennal article III . 



003 



Antennal article IV . 



004 



Antennal article V . 



004 



Left mandible, apical to first marginal 





(La) 



0-09-0- ir 



Left mandible, first to third marginal 





(Li) 



013 



Left mandible, third marginal to molar 





(Lm) 



006 



Right mandible, apical to first marginal 





(Ra) 



O-IO-OII 



Right mandible, first to second mar- 





ginal (R,) 



O-IO 



Right mandible, second marginal to 





molar (R m ) ..... 



006 



Mesonotum width (M) 



0-25-0-27 



Metanotum width (N) 



0-26—0-30 



