A Monograph of the Formicidae of South Africa. 33 



Tribe PEOCEEATIINI, Emery. 



Characters. 



$ . Frontal carinae do not cover the articulations of the 

 antennae, they are close together and are sometimes even fused 

 into a single vertical lamella which is fused to the clypeus. 

 Mandibles triangular ; antennae 9 to 12 joints ; eyes small or 

 wanting. Thorax usually without dorsal sutures ; petiole nodiform 

 or squamiform ; 1st abdominal segment large, separated by a con- 

 striction from the 2nd segment which is large and forms the greater 

 part of the abdomen. Tibiae with only one spur ; claws simple. 



? . Winged; eyes and ocelli well developed, otherwise resembling 

 the $ . 



$ . Clypeus and frontal carinae much the same as in the $ ; 

 antennae 13-jointed ; wings with only one closed cubital cell. 



This tribe contains five genera, two of which are represented in 

 South Africa. 



1. Clypeus very short, but not projecting in a roof -shaped mass above the mouth; 

 body not filiform, apical segments of abdomen incurved under the 2nd segment 

 and reflected, so that the apex points forwards Sysphincta, Roger. 



2. Clypeus fused with the frontal carinae and the cheeks, and projecting in a 

 roof-like manner above the mouth ; body filiform ; apical segments of abdomen 

 straight, not incurved and reflected Probolomyrmex, Mayr. 



Genus PBOBOLOMYBMEX, Mayr. 

 Ann. K.K.N.H. Museum, Vienna, vol. 16, p. 2, 1901. 



Characters. 



$ . Body filiform, head long and narrow. The clypeus is fused 

 with the frontal carinae and the cheeks, forming a projecting ledge 

 over the mouth, in front of the antennae; the frontal carinae, fused 

 in front, are separate behind. The mandibles are hidden by the 

 clypeal projection, and are elongate-triangular and dentate. Antennae 

 12-jointed ; scape long, flagellum claviform but not forming a club 

 •of a definite number of joints. Byes wanting. Thorax without 

 sutures, the declivity of the epinotum surrounded by a raised edge. 

 Node of the petiole compressed, higher behind than in front, longer 

 than wide ; ventral lamella produced into a vertical projection, 

 pointing backwards. Abdomen elongate, not reflexed ventrally ; a 

 slight constriction between the 1st and 2nd segments. 



? and $ . Unknown. 



3 



