A Monograph of the Formicidae of South Africa. 149 



from the base towards its apical margin when seen from the side ; 

 the declivity is very oblique, widest in its lower half, and two 

 and a half times as long as the dorsum. Petiole long, without 

 a scale, and completely hidden under the abdomen. The latter 

 is oval, rather pointed at the apex, all the segments much wider 

 than long. The darker variety differs only in colour from the 

 type. 



Bulawayo, under stones, also in a hollow stem, in shady moist 

 places. Durban ; (C. B. Cooper). 



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



T. nigriventeis, Santschi, race albinasis, Forel. 



Santschi, in Forel, Schultze Forschungsreise Siid-Afr., footnote, 



p. 22, 1910. 



Type species. 



" $ . 2-2 - 8 mm. Pale testaceous yellow, the posterior region of 

 the head, and often the shoulders and dorsum of the thorax more 

 or less brownish, abdomen black. The hairs on the thorax are 

 scanty, fairly short and yellow, they are longer and more abundant 

 on the abdomen and around the mouth. The base of these hairs 

 is often blackish. Pubescence fine, yellowish and moderately 

 abundant all over, slightly lessening the shiningness of the abdomen. 

 Head and thorax sub-opaque. The whole body microscopically 

 reticulate-punctate. Mandibles smooth with a few piligerous 

 punctures. Head a little longer than wide, slightly narrowed in 

 front, the posterior angles rounded, the occipital margin feebly 

 emarginate. The eyes are longer than one-fourth of the sides of 

 the head, their anterior margins reaching the level of the antennal 

 sockets. Clypeus with a wide but shallow median longitudinal 

 groove which ends anteriorly in a distinct emargination. Man- 

 dibles with about a dozen teeth, diminishing in size from the 

 apical to the basal. The scape reaches beyond the occiput by 

 about the length of the 1st joint of the flagellum, the median joints 

 of the latter a little longer than wide. The meso-metanotum is 

 rounded posteriorly in an even curve as far as the floor of the meso- 

 epinotal suture ; the stigmata of the mesonotum do not project 

 above its profile. The profile of the epinotum almost rectangular, 

 with the dorsum about one-third the length of the declivity ; the 

 latter flat and clearly margined. 



Brazzaville, French Congo." 



