A Monograph of the Formicidae of South Africa. 435 



rugae superimposed ; epinotum finely and transversely striate. 

 Nodes dull, very closely reticulate, with a few thin transverse rugae 

 on the 2nd node. Abdomen subopaque and alutaceous at the base, 

 the rest smooth and shining. Head, excluding the mandibles, as long 

 as wide, widest at the posterior third, narrower between the posterior 

 angles than across the anterior margin, the sides convex, the occipital 

 lobes prominent, the occipital emargination deep and angular at the 

 apex. Occipito-frontal sulcus deep behind. Head highest in the middle, 

 as high in front as behind. Sides of the head, between the eyes and the 

 posterior ends of the frontal carinae, shallowly concave lengthwise. 

 The frontal carinae extend back as far as the posterior fourth of the 

 head, moderately divergent in their anterior half, subparallel in their 

 posterior half, prominent and forming a slight demiscrobe. Eyes placed 

 in front of the middle of the sides, convex and not small. Clypeus 

 carinate in the middle, the anterior margin with a wide and shallow 



4 

 Fig. 22. — P. Prelli, Forel, race redbankensis, Forel. 



emargination, the median area smooth and shining, except at the 

 sides, which are faintly striate. Mandibles shining, strongly but sparsely 

 punctured, armed with two large apical teeth. Antennae slender, the 

 scapes strongly curved near the base, extending back to the posterior 

 third of the head. Pronotum, including the neck, a little wider 

 than long, much wider behind than in front, convex in front, the lower 

 posterior angles very obtuse, the upper ones almost obsolete, barely 

 tubercular. Pro-mesonotal suture indistinct. Mesonotum transversely 

 impressed in front of the scutellar portion, the latter is vertical in the 

 posterior half ; the metanotum indistinctly defined, oblique in profile. 

 Meso-epinotal suture wide and shining. Dorsum of epinotum longer 

 than wide, with a deep longitudinal groove from base to apex ; 

 epinotal spines subvertical, barely divergent, fairly acute, longer than 

 their basal width and as long as the interval between their bases ; 

 declivity subvertical, as long as the dorsum. First segment of the 

 petiole twice as long as wide behind, longer than high, the posterior- 

 dorsal face quadrate, the dorsal edge feebly emarginate in the middle. 



