ETHIOPIAN NASUTITERMITINAE 145 



Keys to Species 

 Imagos 



Ocelli smaller, 007-009 x 0-10-013, separated from eyes by half own least 



diameter or more ........... 2 



Ocelli larger, 009-011 x 013-0-16, separated from eyes by less than half own 



least diameter ............ 3 



Fontanelle a pale streak, slightly to distinctly bifurcate in front. Postclypeus less 



inflated, width 2-5 times length ...... convergens (p. 149) 



Fontanelle minute, triangular or 3 spots arranged in triangle, slightly paler than head 



capsule. Postclypeus more inflated, width 2-0-2-1 times length abruptus (p. 145) 



Larger ; W, 0-93-0-99 ; E, 0-34-0-38. Fontanelle irregularly bilobed, sometimes 

 divided into 3 spots, distinctly paler than head. Postclypeus more inflated, width 

 1 -8-i -9 times length, anterior margin straight, posterior arched in middle, sinuate 

 towards outer corners ........ aquilinus (p. 147) 



Smaller ; W, 0-85-0-88 ; E, 0-31-0-33. Fontanelle an elongate rounded triangle, 

 slightly paler than head, or almost obsolete. Postclypeus less inflated, width 21 

 times length, anterior margin very slightly convex or sinuate, posterior regularly 

 rounded indistinct. ........... 4 



Eyes, 0-31 ; Ocelli, 009 x 013 ; T 3 , 120. Fontanelle an elongate rounded triangle 



(S. Congo) .......... bipartitus (p. 148) 



Eyes, 033 ; Ocelli, 010 X 0-14 ; T 3 , 1-00-1-09. Fontanelle almost obsolete 



(Guinean savannah, W. Africa) ...... undulans (p. 150) 



Soldiers 



Posterior lobe of head capsule behind constriction with 1-2 pairs of long conspicuous 



setae, nose thicker, conical, profile nearly straight 



aquilinus (W. Africa, p. 147) and bipartitus (S. Congo, p. 148) 

 Posterior lobe of head capsule with 3-5 pairs of long conspicuous setae. In two of 



three species, nose cylindrical or thinner conical, profile undulating ; remaining 



species, nose conical, profile nearly straight ....... 2 



Nose thicker conical, profile nearly straight. T 3 shorter, 0-57-0-72 (one only over 



0-70). Antennal socket almost without ridge on dorsal side . convergens (p. 149) 

 Nose thinner, cylindrical or conical, profile undulating. T 3 longer, 0-70-0-82. 



Antennal socket usually with ridge on dorsal side ...... 3 



Highest point of " hump " at nose base vertically above middle of postmentum in 



profile, and abruptly depressed behind (Congo forest species) . abruptus (p. 145) 



Highest point of " hump " in front of middle of postmentum, profile more evenly 



undulating. (Guinean savannah species, W. Africa) . . undulans (p. 150) 



Eutermellus abruptus sp. n. 



(Text-figs. 399, 400, 414-416, 431-433. 479-481 ; Map 30) 



Imago. Head capsule sepia brown with paler markings on frons, postclypeus and antennae 

 yellow-brown, labrum yellow. Pronotum, meso- and metanota brown, other thoracic sclerites 

 and legs yellow. Abdominal tergites brown, sternites yellow-brown. 



Posterior margin of head capsule behind eyes evenly rounded, slightly less than semi-circular, 

 turned slightly outwards at eye rim ; fontanelle, paler than head capsule, minute triangular or 

 three spots arranged in triangle ; eyes oval, slightly set out from sides of head, prominent in 

 proportion to own diameter and large relative to head width, W/E index 2-6-2-9 ; ocelli small 



