ETHIOPIAN NASITITERMITINAE 81 



12 Frons usually with two shallow diverging depressions in front of fontanelle . . 13 



- Frons without such depressions, though sometimes with single median depression 



(see also 9 above) ........ rhodesiensis (p. 114) 



13 Eye relatively smaller, YV/E index 3 0-3 5. Postclypeus more inflated, width 



1-9-2-2 times length. Ocelli separated from compound eyes by one-fifth to one- 

 half own shortest diameter. East, Central, South Africa. . rapulum (p. no) 

 Eye relatively larger, W/E index 2-6-3-0. Postclypeus less inflated, width 2-2-2-6 

 times length. Ocelli separated from compound eyes by one-tenth to one-fifth own 

 shortest diameter. W. Africa, N. Congo, S. Sudan, N. Uganda occidentalis (p. 100) 



14 Pilosity of " forehead " consisting of a " pelt " or " mat " of short, curved setae of 



even length, with scattered long setae 3-5 times longer than these (Text-figs. 383, 

 385). Scent gland on fifth abdominal sternite of female smaller, width usually 

 under o-9mm., length under o-2mm. (some T. trinervius larger, approach the 

 larger dimensions of T. oeconomus) ........ 15 



- Pilosity of " forehead " uneven, setae generally straight or slightly curved, length 



variable from very short to long, not forming an even " pelt " (Text-fig. 384). 

 Scent gland on fifth abdominal sternite of female larger, width over i-omm., 

 length over 03mm. (some T. geminatus have more uneven pilosity, but these have 

 the small scent gland on the fifth female abdominal sternite) . . .16 



15 Postclypeus, more strongly inflated, width 2-2-2-4 times length. Eyes larger in 



proportion to head width, W/E index 2-3-2-9. Cerci of female usually longer than 

 basal breadth, some equal ....... trinervius (p. 127) 



- Postclypeus, less inflated, width 2-4-2-8 times length. Eyes smaller in proportion 



to head width, W/E index 2-7-3-0. Cerci of female shorter than basal breadth, 

 rarely equal ......... geminatus (p. 92) 



16 Pilosity of " forehead " sparse and fine. Postclypeus more inflated, width 2-0-2-3 



times length. Ocelli separated from eyes by one-sixth to two-fifths own shortest 

 diameter. Cerci of female as long as basal breadth, or shorter. East Africa, 

 S. Uganda, S. Congo, N. Angola ...... gratiosus (p. 97) 



- Pilosity of " forehead " abundant and coarse (Text-fig. 384). Postclypeus less 



inflated, width 2-3-2-6 times length. Ocelli separated from eyes by one-fifteenth 

 to one-quarter own shortest diameter. Cerci of female longer than basal breadth. 

 W. Africa across to N. Uganda and Sudan .... oeconomus (p. 105) 



Soldiers (Major soldiers only) 



1 Nose in profile cylindrical or weakly conical (angle of cone 0-14 degrees) . . 2 



- Nose in profile moderately to strongly conical (angle of cone 15-25 degrees) . . n 



2 Nose tip distinctly hairy ........... 3 



Nose tip with four prominent setae at most, often fewer or none, and with a few 



minute, pale setae behind them, or none ....... 6 



3 Antennae 13 segmented ........... 4 



- Antennae 14 segmented ........... 5 



4 Fontanelle large, 005mm. to over 01 mm. across. Nose in profile more broadly 



conical towards base. Head capsule in plan view " shouldered " behind base of 

 antennae (Text-figs. 282-289) ...... occidentalis (p. 100) 



- Fontanelle small o-03-o-05inm. across. Nose in profile evenly tapered to near 



base. Head capsule evenly rounded in plan view (Text-figs. 351-358, 376-378) 



T. arabiae (p. 82) and togoensis (p. 122) 



5 Nose usually as long as or longer than rest of head capsule measuring from hind 



margin of antennal socket. South Africa, parts of South-Central Africa 



trinervoides (p. 132) 



- Nose usually shorter than rest of head capsule, measuring from hind margin of 



antennal socket. West Africa, N. Congo, across to Sudan, N. Uganda . . 12 



