A Monograph of the Formicidae of South Africa. 271 



Scapes long, extending beyond tlie occipital margin by nearly one-third 

 of their length. The pro-mesonotal suture faintly indicated by a 

 shallow impression ; the ineso-epinotal suture very deep. The anterior 

 and posterior lateral dorsal angles of the pronotum fairly pronounced, 

 the ventral lateral angles produced into large triangular teeth, a little 

 longer than their basal width, very prominent, and projecting well 

 beyond the lateral outline of the thorax, when viewed from above. 

 Pronotum twice as wide as long. Mesonotum posteriorly with the 

 lateral carinae high, almost angular when seen from the side, but not 

 expanded outwards. Base of the epinotum feebly raised and slightly 

 expanded outwards at the sides. The dorsum of the epinotum 

 margined, about one-quarter longer than wide at the base, distinctly 

 concave transversely. The spines are horizontal, subparallel, about as 

 long as the distance between them. The declivity is sharply margined 

 at the sides, nearly vertical, shorter than the dorsum. The peduncle 

 of the 1st joint of the petiole long and thin, a trifle longer than the 

 node. The latter is compressed above, as high as long, its dorsal 

 profile convex, and including the narrow posterior portion as long as 

 wide, the anterior and posterior faces nearly vertical. The 2nd node 

 is also laterally compressed above, but not so much as the 1st node, 

 longer than the 1st, but hardly wider, subconical, highest posteriorly. 

 Base of abdomen straight, the corners rounded. Legs long and 

 slender. 



Matopo Hills, S. Rhod. 1 y. In my collection. 



Tiube TETRAMORIINI, Emery. 



This tribe includes the following genera: Tetramorium (with 

 sub-genera Triglyphothrix, Xiphomyrmex and Becamorium), Tetra- 

 myrma and Rhroptromyrinex. 



Genus TETRAMORIUM, Mayr. 

 Verb. Zool. Bot. Ges. Wien, v, p. 423, 1855. 



Characters. 



$. Antennae 10-, 11- or 12-jointed, with a 3-jointed club; 

 maxillary palpi 4-jointed, labial palpi 3-jointed. The posterior 

 margin of the clypeus is raised on each side into a ridge or carina, 

 which separates the front of the clypeus from the antennal socket 

 (see Text-fig. 19, a and b). Frontal carinae short and fairly wide 



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