E T H I ( ) I ' I A N N ASUT I T ERMI T I X A E 



107 



at nose tip with smaller setae behind them, sometimes very sparse ; dorsal surface of head 

 without prominent setae. Middle abdominal tergites with very sparse scattered minute setae, 

 scarcely visible in profile, only slightly longer on posterior tergites. Sternites with short back- 

 ward directed scattered setae, and longer downward or slightly forward directed setae on 

 posterior margins, arranged approximately in 6 longitudinal rows, 3 or more times length of 

 shorter setae. 



Minor soldier ; head capsule orange-yellow to reddish chestnut brown, nose ferruginous 

 orange to brownish black with red tip Antennae 13-14 segmented, proportions of basal 

 segments variable. 



Measurements (Major soldiers, 60 specimens from 20 localities, minor soldiers, 11 specimens 

 from localities) in millimetres. 



Ma fur Soldiers : 



Range 



Mean 



Head length to tip of imse 



1-95-2-65 



233 



Head width . 



1 13-163 



i-39 



Depth of head capsule 



o-8o-i 08 



097 



Width of pronotum 



0-55-0-73 



065 



Length of pronotum 



0-23-0-36 



030 



Length of hind tibia 



1-40-1-82 



1 64 



Minor Soldiers : 



Range 



Mean 



Head length to tip of nose 



1-50-1-82 



1 -66 



Head width . 



0-64-0-82 



074 



Depth of head capsule . 



0-50-0-64 



o-57 



Width of pronotum 



0-43-0-50 



046 



length of pronotum 



0-18-0-25 



0-22 



Length of hind tibia 



1-20-1-50 



I 40 



T. oeconomus is similarly variable to its sympatric congeners, with which it is 

 easily confused. It is distinguishable in the $ imago from T. geminatus by the 

 larger " scent " gland on the fifth sternite and the longer cerci, and from both this 

 and T. trinervius by the uneven vertex pilosity. In the soldier caste, T. trincrvius 

 is much darker in colour and has few nose setae. Most T. geminatus are also darker, 

 with slightly more prominent abdominal setae, but indistinguishable specimens do 

 occur. Larger, paler specimens of T. togoensis have been found to occur at greater 

 altitudes, and these sometimes have 14 segmented soldier antennae, thus also 

 becoming indistinguishable from T. oeconomus. Of the allopatric species, the 

 closest is T. gratiostis, in which the imago has a more inflated postclypeus, ocelli 

 usually further from the eyes, and shorter female cerci. The paler coloured soldiers 

 of this species are almost indistinguishable from T. oeconomus, except that the nose 

 tip of the latter has more setae in the majority of specimens. 



The synonymy of this species is straight-forward apart from T . mobilis, which 

 was described from imagos collected at light. The syntype material consists of 

 two species, the larger of which corresponds to the original description, the smaller 

 being T. togoensis. Snyder (1949) synonymised T. mobilis with T. trinervius, 

 but the accepted usage of the latter is for the species also named T. posselensis and 

 T. carbonarius. This I regard as correct and therefore use the next oldest name, 

 T. oeconomus for the species to which the specimens named T. mobilis by Sjostedt 

 also belong. 



