A Monograph of the Formicidae of South Africa. 157 



but slightly below the level of the dorsum, from which it is not 

 clearly delimited. Petiole flattened as in the other species, but 

 more parallel-sided. Legs very long. 



Matetsi, near the Victoria Falls. The nest of this species is 

 placed in rather loose sandy soil. It is a very quick and erratic ant, 

 and, owing to its colour, difficult to distinguish from the ground 

 which it frequents. 



(G.A. coll.) 



Genus SEMONIUS, Forel. 



Schultze' Eeise im west, and zentral Siidafrika, Formicidae, p. 21, 



1910. 



Characters. 



$ . Clypeus entire. Antennae 11-jointed, ftagellum strongly 

 incrassate, almost clavate. Anal orifice inferior. 



? . Much larger than the $ . Head very elongate, much longer 

 than wide. Wings with 1 closed cubital and 1 radial cell. 



$ . Scape half as long as the flagellum. Mandibles well 

 developed. Pronotum not exposed. Genital armature exserted. 

 Smaller than the $ . "Wings as in the ? . 



S. Schultzei, Forel. (Plate IV., fig. 45.) 



Loc. cit. p. 21, £ . Santschi, Voy. d'Alluaud and Jeannel, p. 120, 



$, 1914. 



£ . 1*8-2 mm. Black or brownish, dull or only very slightly 

 shining. Pubescence greyish, dense and microscopic ; a few pilose 

 hairs on the clypeus. Microscopically and closely punctured. Head 

 one-fifth longer than wide, the sides moderately convex, the hind 

 angles strongly rounded, the posterior margin almost straight. The 

 anterior margin of the clypeus is straight or nearly so. The frontal 

 carinae rounded, very short, nearer to the eyes than they are to each 

 other. Eyes moderately large, flat, situated in front of the middle. 

 Mandibles smooth and shining, with a few small punctures, feebly 

 dentate. The scape reaches back as far as the posterior fourth 

 of the head; all the joints of the flagellum, except the 1st and last, 

 wider than long, the last three joints form a slight club. Thorax 

 shorter and much narrower than the head, distinctly convex longitu- 

 dinally. Thoracic sutui'es distinct. Pronotum one-third wider than 

 long, sloping steeply in its anterior half. Mesonotum wider in 

 front than behind, one-third wider than long. The dorsum of the 

 epinotum is as wide as the mesonotum, and is not clearly delimited 



