376 Annals of the South African Museum. 



obtusely angular, wider than long, more convex transversely in front 

 than behind. The anterior face straight and inclined, a little shorter 

 than the peduncle. Second node two and a half times "wider than 

 long, feebly emarginate in front, surrounded by a large mass of spongy 

 tissue which extends below the 1st node^ 

 "Lake Sibayi, Zululand. (Traegaordh)." 



. S. Arnoldi, Forel. (Plate VIII, figs. 117, llla-d.) 

 Ann. Soc. Ent. Belg., vol. 57, p. 114, £, 1913. 



$ . 1'8 mm. Reddish-ochreous ; legs, antennae, and mandibles a 

 little paler. Head dull, very densely reticulate -punctate. Dorsum 

 of thorax and the 1st node subopaque and reticulate-punctate, but 

 much more shallowly than the head ; the pronotum longitudinally 

 and irregularly striate in addition. Sides of thorax, 2nd node, and 

 abdomen smooth and shining. The abdomen with 4 or 5 strong and 

 oblique striae on each side of the base, extending beyond the basal 

 third of the 1st segment. Legs and scapes closely reticulate-punctate 

 and dull. Mandibles rugulose. Pilosity on the head composed of 

 whitish-yellow spatulate hairs (see fig. 1176), fairly abundant and 

 evenly disposed. A row of 7 hairs, directed outwards, lies on the 

 outer margin of each scape. The pilosity of the thorax, nodes, and 

 abdomen very sparse and irregular, composed of long clavate hairs 

 (see fig. 117a). Femora and tibiae more sparsely pilose, the hairs 

 smaller and more decumbent and less distinctly spatulate. Mandibles, 

 tarsi, and flagellum with a sparse decumbent pubescence. 



Head, excluding the mandibles, one-fifth longer than wide (or 

 including the posterior lateral lobes, two-fifths longer), a little more 

 than twice as wide at its greatest width as it is across the anterior 

 margin of the clypeus ; fairly convex at the sides over the posterior 

 third, almost parallel-sided in front, the posterior margin concave, 

 deeply and widely emarginate. Scrobes deep, distinctly margined 

 above and below, and divided in the basal half by a strong and 

 longitudinal ridge. Eyes small, composed of 4 or 5 facets, placed 

 below the lower margin of the scrobe and not visible from above. 

 Clypeus triangular, equilateral, the anterior margin straight. Frontal 

 carinae convex outwardly above the antennal sockets, thence widely 

 divergent. First and 4th joints of the flagellum subequal, 2nd and 

 3rd wider than long, 5th joint one-third longer than the rest of the 

 flagellum. Mandibles linear, half as long as the head, almost parallel, 

 feebly convex externally, armed with 4 long and spiniform teeth. 

 Two of these subequal and placed at the apex, the innermost at about 



