A Monograph of the Formicidae of South Africa. 333 



sparsely punctured, the masticatory margin piceous, with 3 distinct 

 teeth in front, indistinctly denticulate behind. Clypeus feebly 

 carinate in the middle. Frontal area triangular, fairly well defined. 

 Thoracic sutures obsolete. Thorax narrower than the bead, widest in 

 front, narrowing gradually behind towards the epinotal teeth, slightly 

 constricted between the meso- and epinotum, one and a half times 

 longer than Avide in front, the shoulders of the pronotum rounded. In 

 profile, the thorax is moderately convex lengthwise, the dorsum of the 

 epinotum oblique and merging gradually into the declivity. Epinotal 

 spines acute, divergent, half as long as the interval between their 

 bases, hardly longer than their basal width, one-third longer than the 

 episternal teeth. Declivity marginate at the sides. Peduncle of the 

 petiole half as long as its node ; the latter, seen from above, is sub- 

 globose, nearly one-quarter wider than long. Seen in profile, it is 

 obliquely truncate in front, and the posterior-dorsal face is convex. 

 The 2nd node is transversely oval, twice as wide as long, one-quarter 

 wider than the 1st, convex transversely and longitudinally, as wide in 

 front as behind. Abdomen globose. Femora very slightly swollen. 



Hillside, Bulawayo, in sandy soil. (S.A.M., R.M., G.A. colls.), type 

 in my collection. 



This species appears to me to be intermediate in structure between 

 Tetramorium s. str. and its subgenus Triglyphothrix. The absence of 

 branched hairs and the less transverse 1st node are the only points of 

 difference between it and the subgenus. 



I have much pleasure in associating this species with the name of 

 Mrs. Hepburn, whose unfailing hospitality has given me the oppor- 

 tunity to collect many of the interesting species which are found at 

 Hillside, near Bulawayo. 



Subgenus Triglyphothrix, Forel. 

 Ann. Soc. Ent. Belg. C.E., vol. 34, p. cvi, 1890. 



Characters. 



^ . Antennae 12-jointed, the club 3-jointed. Mandibles and 

 clypeus as in Tetramorium. Distinct antennal scrobes nearly always 

 present, divided by a longitudinal carina into two halves, for the 

 reception of the folded scape and flagellum. Thorax stout and short, 

 the thoracic sutures obsolete or nearly so. Epinotum armed, episternal 

 teeth also present, as in Tetramorium. First joint of petiole with a 

 short peduncle ; both nodes, or at least the 2nd, much wider than 

 long. Hairs usually trifid, sometimes polyfid. 



