348 Annals of the South African Museum. 



one-third wider than long, the dorsal surface much flatter than in the 

 $ , the posterior half of the sides parallel. The eyes are large and 

 occupy the anterior half of the sides of the head. The scape extends 

 bach as far as the anterior ocellus, and is a little shorter than the 2nd 

 joint of the flagellum. 



Victoria Falls, nesting in very moist and rotten wood, and under moss. 

 (S.A.M., K.M., G.A. colls.) 



T. (xiphomyrmex) possulatum, Forel. (Plate VII, figs. 107, 109) 



Ann. Soc. Ent. Belg., vol. 54, p. 428, $ , 1910. 



^ . 2*2-2"7 mm. Castaneous, thorax, nodes, and base of abdomen 

 paler, more yellowish-brown. Legs, antennae, and mandibles yellowish- 

 brown. Pubescence very sparse, present only on the antennae and 

 tibiae. Pilose hairs absent, except on the clypeus. Entirely smooth 

 and shining. Head and thorax sparsely and irregulaidy punctured 

 with wide and shallow pits, more sparsely on the thorax than on the 

 head, the latter almost impunctate anteriorly. Head, excluding the 

 mandibles, a little wider than long, feebly narrowed in front and 

 behind, the posterior margin straight. Eyes large, placed in the 

 middle of the sides. Frontal carinae widely divergent behind, pro- 

 longed back as sharp ridges to the posterior fourth of the head, 

 forming distinct demiscrobes which are smooth and deep, and hold the 

 basal three-fourths of the scapes. The basal half of the scrobe is 

 delimited below by "a longitudinal ridge. Clypeus short, the anterior 

 margin denticulate, carinate in the middle, the carina extending back 

 over the well defined and triangular frontal area. Mandibles smooth, 

 sparsely punctured, tridentate, the anterior pair of teeth close together 

 and separated from the third tooth by a wide space. Scapes extending 

 back as far as the occipital margin, 2ud-7th joints of the flagellum 

 wider than long, the club thick. Thorax as wide in front as it is long, 

 flat above, except the pronotal shoulders, which are depressed. The 

 pronotum bears an angular prominence, somewhat obtuse, on each side 

 behind the middle. Pro-mesonotal suture feebly indicated ; the meso- 

 epinotal obsolete above. Dorsum of epinotum impunctate, quadrate, 

 submarginate. Epinotal spines long, divergent, acute, as long as the 

 interval between their bases, directed steeply upwards. Episternuin 

 with a small rounded lobe on each side. Declivity marginate at the 

 sides. First node of the petiole cuneiform, with a vertical anterior 

 face, and a horizontal dorsal face, the margin between the two faces 

 rounded, the peduncle very short, hardly differentiated from the node. 

 Second node rectangular, wider than long, as long as and a little wider 



