A Monograph of the Formicidae of South Africa. 419 



sharply angular or obtusely spinose at the sides. An oblique depres- 

 sion above and behind the eyes is more or less noticeable. 



1. Sides of second node merely angular ; transverse torus on the meso- 

 notum feeble ; epinotal teeth small . . capensis, Mayr. 



2. Sides of second node obtusely spinose ; transverse torus on the meso- 

 notum strong ; epinotum armed with fairly long spines 



xocensis, Forel. 



(F) Spintjlosa Group. 



"2/ . Head longer than wide, the sides moderately convex or nearly 

 straight, the occipital emargination wide, not deep, arcuate at its apex. 

 Posterior half of the head shining. Second node acutely dentate or 

 spinose at the sides. 



1 . Head as wide in front as behind, its sides straight and subparallel 



Schultzei var. gwaaiensis, Forel. 



2. Head narrower in front than behind, its sides convex 



spinulosa Forel. 



(Gr) ScULPTURATA Group. 



Usually rather large forms in 1/ and ^ castes. 



1/. Head longer than wide, the sides fah'ly straight. Occipital 

 emargination deep, its apex angular. Second node of petiole strongly 

 spinose at the sides. 



^ . Second node more or less distinctly angular at the sides. 



(6) 1. The whole of the head dull and sculptured, at the most only the 

 apices of the occipital lobes smooth and shining. 



(3) 2. Posterior third or half of the head with obliquely tranverse rugae 



extending outwards from the occipital sulcus ; epinotum usually 

 armed with long spines in the $ 



Liengrnei, Forel, and races and varieties. 

 (2) 3. Posterior third or half of the head not transversely rugose ; epinotum 



armed with short teeth in the $ . 

 (5) 4. Small species, If less than 5 mm. long, the head less than 2 mm. long 



Alcermani, Arnold. 



(4) 5. Larger species, If. more than 5 mm. long, the head at least 2 - 7 mm. long 



sculpturata, Mayr, and races and varieties. 

 (1) 6. Posterior third or half of the head smooth and shining 



excellens, Mayr, race rhodesiana, Forel. 



(H) Crassinoda Gfroup. 



1/ 1/ and $ $ large. 



1/ . Head distinctly convex at the sides and above (somewhat 

 resembling the 7/ of the punctulata group), much wider behind than 



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