OBSERVATIONS ON SOME SOUTH AFRICAN TERMITES. 467 



scattoi'ed hairs. Dorsal outline very evenly horseshoe-shaped ;, 

 cephalic region much narrowed. 



Fontanelle minute (diameter 11 /u), generally in the apex of 

 minute V groove and with a parallel series of short curved 

 wrinkles immediately posterior to it. 



Frontal area not deeply depressed ; with a medium trian- 

 gular mound, the base of which may extend to the cephalic 

 margin of the clypeus or may be interrupted at a wrinkle 

 which represents the clypeo-frontal suture ; in the apex of 

 this mound, a little anterior to the fontanelle, a black, imper- 

 forate, chitinised spot, like an obsolete foramen. 



Eye-spots large, oval, pale, vaguely facetted ; diameters- 

 170 X IbSju; surrounded by concentric wrinkles. 

 Ocelli quite obsolete. 



Clypeus somewhat convex with a pale plate-like extension 

 (the epistome) ; cephalic margin curvate ; sides straight. 



Labrum concolorous with head and with a larg-e white 

 cordate lingula. 



Mandibles black throughout ; large (3'3 to 3*4 mm. long) > 

 simple ; both incurved and upcurved. Left the more up- 

 cui'ved; straighter and broader than right, proximal third 

 with a produced piece, the distal end of which very short, 

 incurved and pointed ; proximal to this a small conical 

 process. Right mandible attenuated ; more incurved than 

 left ; distinctly elbowed at half its length and presenting a 

 small protuberance on the inner margin a little below the 

 elbow. 



Antenna? XVII-, XVIII- or XlX-jointed; the XVIll- 

 jointed antennae formed by the failure of either III and IV 

 or V and VI to separate. The XVII-jointed through the 

 failure of III-VI to separate. The following is an analysis of 

 26 iintennse from 13 insects : 

 7 v/ith 19 joints. 

 11 „ 19 „ V and VI fused but showing pseudo- 

 articulation. 

 1 „ 18 „ III and IV fused but showing pseudo- 

 articulation. 



