OBSERVATIONS ON SOME SOUTH AFRICAN TERMITES. 435 



WOKKER. 



Measureineiits. — Head-widths 2*5 to 4*5 nnn. ; total 

 length 9*5 to 14 mm. 



Head. — Vertex intensely black, colour extending over 

 median frontal area towards base of clypeus ; frontal folds 

 <3hestnut brown ; yellow patches median and lateral to 

 antenna] fossa3 on cephalic margin of head ; clypeus with 

 epistome ti'anslucent, with a broad dark median stripe 

 bordered with white patches; labrum yellowish; trochantin 

 of mandible white. Dorsal outline open U-sh^ped ; cephalic 

 extremity broadened ; sides convex, slightly curvate, tapering, 

 tapering more decidedly in small workers than large, bending 

 in to trochantin of mandible ; Y-suture distinct, especially 

 in small Avorkers where it is pale in colour; vertex flatly 

 arched. 



Fronswith cephalic area presenting a small median mound 

 and lateral to this two depressions ; separated from clypeus 

 by a groove connecting two lateral incisions (an incomplete 

 clypeus-frontal suture). 



Ocelli represented by pale spots. 



Eyes black and sub-reniform. 



Clypeus large, broad ; epistome plate-like and prolonged 

 with a narrow straight margin and incurvate oblique sides; 

 apex of clypeus elevated and forming a distinct transverse 

 ridge reaching almost from side to side. 



Labrum large ; cephalic margin broadly rounded; anterior 

 lateral corners lobed ; sides incurvate and tapering. 



Mandibles reddish-yellow or chestnut with black points. 



Antennae a pale sordid brown; HI, lA^, V annular, sub- 

 equal, IV generally the largest of the three in the largest 

 workers and the smallest in the smallest workers. 



Thorax. — Constricted, nari'ower than head; dark black- 

 brown, except that the cephalic margin of the pronotum is a 

 paler sordid brown; pro-, meso- and metanotum with a pale 

 ■median line. 



Pronotum with cephalic margin rounded, entire, arched, 



