272 Annals of the South African Museum. 



apart, or long and forming the upper margin of a scrobe. Antennal 

 scrobes frequently present. Promesonotal suture generally obsolete 

 or feebly defined, meso-epinotal suture usually distinct. Epinotum 

 armed above with two spines or teeth, and below with two episternal 

 teeth or lobes. Nodes of petiole variable, the 1st node always 

 pedunculate, the 2nd node usually wider than the 1st. Abdomen 

 oval, 



$ . Like the $ but larger. Pronotum usually very little exposed 

 above ; mesonotum and scutellum raised above the level of the pro- 

 and epinotum. The latter with stouter and shorter spines or teeth 

 than in the ty . Fore wing with one cubital, one discoidal and a 

 closed radial cell. Otherwise like the $ . 



xf- -ri- 



se 



Fig. 19. — A. Dorsal. B. Profile, m. Median area of the clypeus. 

 Ir. Lateral ridges of the clypeus. of. Antennal fossa or socket. 

 sc. Scape, j. Mandible. Anterior portion of the head of a 

 Tetramoritim, the depth of the antennal fossae slightly 

 exaggerated. 



^ . Antennae 10-jointed,* the 2nd joint of the flagellum very 

 long and representing four joints fused together. Head small, eyes 

 large. Mandibles small but distinctly dentate. Pronotum not visible 

 from above ; mesonotum gibbous, Mayrian furrows present. Epinotum 

 truncate and bidentate. 



The clypeus has usually at least one median and longitudinal raised 

 line, which when fairly high may be termed a carina. It should be 

 noted, however, that the clypeus very often bears other raised lines 

 on each side of, and quite as strong as the median carina. 



The lateral ridges are almost obsolete in the sub- genus Decamorium. 

 The frontal carinae are often produced backwards almost to the 



* T. solidum, var. grootensis, Forel, is an exception, having 12-jointed 

 antennae, and T. Emeryi, Mayr, has 13-jointed antennae. 



