A Monograph of the Formicidae of South Africa. 89 



Genus LEPTOGENYS, Eoger (Forel). 

 Berlin Ent. Zeitschr., vol. 5, p. 12, 1861 (s. stricto) ; Jahrb. 

 Hamburg Wiss. Anst., vol. 10, p. 6, 1893 (s. latiore). 



Characters. 



£ . Clypeus usually carinate, and produced in the middle 

 anteriorly as a lobe or small platform. Mandibles linear or tri- 

 angular with the masticatory margin dentate, or narrow and 

 edentate. Antennae generally filiform. Meso-epinotal suture 

 usually distinct. 



? . It is probable that all the ? ? of this genus are ergatoid. 



$ . Claws pectinate, thereby differing from the $ $ of all other 

 Ponerinae. Scape short. Mensonotum with well-defined Mayrian 

 furrows. 



This genus is divided into 4 sub-genera, of which the two following 

 alone are represented in our region. 



1. Mandibles very elongate, crossing each other only slightly and enclosing a 

 large space between them and the clypeus ; linear and acute, or ending in 

 two small teeth placed close together Leptogenys, Eoger. 



2. Mandibles triangular, dentate, or narrow and with a terminal tooth ; in the 

 latter case they are much shorter than in Lejrtogenys, and do not enclose a 

 large space in front of the clypeus Lobopelta, Mayr. 



Sub-Genus LEPTOGENYS, Eoger. 

 Berlin Ent. Zeitschr. vol. 5, p. 12, 1861. 



Key to the $ £ of Leptogenys, s. str. 



(2). 1. Body entirely dull, covered with a pruinose pubescence . . maxillosa, Smith. 



(1). 2. Body without any pruinose pubescence. 



(8). 3. Whole body shining. 



{7). 4. Node of petiole seen in profile, quadrant-shaped, seen from above much 



wider behind than in front. 

 {6). 5. Head wider at the anterior margin than it is across the eyes. 10-11 mm. 



Stuhlmanni, Mayr. 

 {5). 6. Head not wider at the anterior margin than it is across the eyes, 95 mm. 



Schwabi, Forel. 

 {4;. 7. Node of petiole seen in profile, not quadrant-shaped, seen from above only 



a little wider behind than in front, 47 mm Ferrarii, Forel. 



(3). 8. Body dull, except the posterior portion of the abdomen, 5 - 5 mm. 



cribrata, Emery. 



L. maxillosa, Smith. (Plate III., fig. 24.) 

 Cat. Hymen. Brit. Mus., vol. 6, p. 93, % $, 1858. 

 $ . 6-6"5 mm., excluding the mandibles. Black ; antennae, 

 mandibles (except the extreme base which is piceous), femora, tibiae 



