A Monograph of the Formicidae of South Africa. 41 



convex from above to below, and from side to side, not flat in the 

 middle and below as in sellaris. (S.A.M., E.M., G.A., coll.) 



Genus STEBBLOGNATHUS, Mayr. 

 Verb.. Zool. Bot. Ges. Wien, vol. 12, p. 716, 1862. 

 The genus includes only a single species. 



S. aethiopicus, Smitb. (Plate I., fig. 5.) 



Cat. Hymen. Brit. Museum, vol. 6, p. 91, £ , 1858. Emery, Ann. 

 Soc. Ent. Belg., vol. 43, p. 468, $ , 1899. 



£. 18-22 mm. Black, mandibles piceous, anterior tarsi beneath 

 with dense golden hairs. Head and thorax dull, petiole and abdo- 

 men shining. A very short pale pubescence on the whole body, 

 dense on the head and thorax, exceedingly scanty elsewhere. The 

 pilosity consists of short thick hairs, dense on the head, scape and 

 legs, scanty on the rest of the body. The head is very finely 

 reticulate-punctate, the thorax finely striate, the abdomen smooth 

 and shining, with a few fine punctures ; 3rd-5th segments a little 

 more strongly and closely punctured, and with longer hairs. 



Head, excluding mandibles, almost rectangular, with the posterior 

 angles rounded ; considerably wider than the thorax. 



Clypeus somewhat projecting, and sharply truncate inwardly in 

 front, so that a deep depression lies between it and the labrum ; it 

 is raised roof-shaped in the middle, the declivity on each side ending 

 at about half the distance from the external angles ; on each side 

 anteriorly it is produced into a blunt tooth which lies about half- 

 way between its centre and the base of the mandible. Frontal area 

 elongate and sharply defined, produced backwards almost two-thirds 

 the length of the frontal carinae. The latter are short, dilated in front, 

 and project over the insertion of the antennae. Mandibles two-thirds 

 the length of the head, oblongo-triangular, coarsely punctured on the 

 masticatory margin, which is oblique and longer than the basal. 

 Antennae long, the scape reaching back to the middle of the 

 mesonotum, scape and flagellum together reaching a little beyond 

 the middle of the 1st abdominal segment ; flagellum filiform, the 1st 

 joint two-thirds the length of the 2nd. Eyes more dorsal than 

 lateral, moderately lai"ge and situated in about the middle of the 

 length of the head. 



Pro-mesonotal suture distinct, the meso-metanotal suture less so. 

 Mesonotum raised higher than the pronotum ; the metanotum and 



