A Monograph of the Formicidae of South Africa. 415 



or spines, seen from above, more or less lenticular or lozenge-shaped. 

 Abdomen oval, the 1st segment larger than the remaining segments 

 taken together. 



£ . Antennae 12-jointed, usually very long, rarely shorter than 

 the head and thorax together. Head of normal proportions, the 

 occiput not emarginate, but generally convex. Thorax longer than 

 in the % ; the pro-mesonotum not gibbous as in the 1/ , but never- 

 theless retaining (on a much reduced scale) the general features 

 exhibited in that caste ; the scutellum hardly defined, the metanotum 

 not at all. Epinotum bispinose or bidentate. First node of petiole 

 with a fairly long peduncle, the node much thicker above than in 

 the 1/ ; the 2nd node globose or campaniform, rarely transverse. 

 Abdomen relatively longer than in the 3/ . 



f" 



pronolurn* 



r^, 



s ,. 



mcso nol'u rrl~ 



v*^ 





. soute/lu-rru . 





/neta.nol'utn-1.- 



; *%# v 



Fig. 20. — Head and thorax of P. excellens, race rhodesiana. If. . 



$ . Antennae 12-jointed. Head not wider, or very little wider 

 than the thorax, not emarginate posteriorly, but rather convex or 

 only feebly concave. Pronotum without tubercles or prominent 

 angles, not exposed above. Mesonotum usually flat above in its 

 posterior half. Dorsum of epinotum short and declivous ; the spines 

 or teeth generally broader and relatively much shorter than in the 

 ^ and 1/. Petiole very similar to that of the 7/. Abdomen 

 elongate-ovate, not very convex above, with more or less pronounced 

 basal angles. Wings fairly long, with two closed cubital cells. 



$ . Antennae 13-jointed, the scape very short, rarely more than 

 half as long as the long diameter of the eyes, flagellum filiform, 

 the 1st joint globose. Head much wider in front than behind. 

 Mandibles small, usually dentate. Eyes and ocelli large. Median 

 area of clypeus convex. Frontal carinae very short, ill defined. 

 Thorax similar to that of the ? , but the mesonotum is more convex 



