The Termites of South Africa 1 1 1 



from Steinkopf referred to trinervius by Silvestri (1908) and 

 redescribed as l^alaharicus by Holmgren.* The imagos only appear 

 to differ from the type in having wider heads, 1.9 to 1.95. The 

 ocelli are about or a little less than their short diameter from 

 the eyes. The antennae are XVI. and XVII. jointed, commonly 

 XVI,, when joint III. m.ay occasionally be a shade longer than 

 II. 



The major nasuti differ in being larger, in having the nose 

 shorter than the head height (18:19) and in exhibiting XIV. 

 jointed antennas with joint III. noticeably longer than II. (9:7) 

 and almost as long as IV. The hind margins of the antennal 

 foveola a little before half the head length (22 : 4 and 

 22:23). Head length 2.4; height 1.00; ^vidth 1.4 to 1.5. 



The minor nasuti exhibit antennae of XIII. and XIV. joints. 

 In XIII., joint III is exceptionally long and a compound (III. 

 plus IV. of the XIV. expression). In XIV., joint III. varies in 

 length from being as long as II. to plainly longer as in the major. 



The workers exhibit XV. jointed antennae and a head width of 

 1.52-1.62. 



Trinervitermes gemellus sub. sp. thomseni s.sp.nov. 



Represented by a nest series from Pearston, Somerset West 

 (F. Thomsen, November 1920). The imago antennae are XVI. 

 and XVII. jointed with joint III. a shade longer than II., not 

 shorter. The ocelli are larger than in the typical form and half 

 the short diameter from the eyes. Both major and minor nasuti ex- 

 hibit antennas of XIV. joints with joint III. about as long as II. 

 The heads of the major nasuti are paler than in the typical form 

 and the bodies and legs pale golden yellow, not sordid; further 

 the heads are a little more elongate and plainly smaller (head 

 wadth 1.16, gemellus 1.37). 



Trinervitermes irinerviformis Holmgren (1913). 



= Trinervitermes auriceps Holmgren. 



= Trinervitermes hulbiceps Holmgren. 



= Trinervitermes duhius Holmgren. 



= Termes trinervius (in part) Fuller (1915). 



*The criteria given by Holmgren seem to have been selected 

 from nanitic forms amongst those reported by Silvestri. 



