A Monograph of the Formicidae of South Africa. 665 



petiole thick, the posterior face convex transversely, the anterior 

 face slightly concave, the dorsal edge rounded, thick, feebly convex 

 from side to side. Wings as in the 9- 

 Cape Town. (S.A.M. coll.). 



C. crepusculi n. sp. (Plate IX, figs. 155, 155ns). 



%, 7'2-8 - 5 mm. Similar to emarginafus, but larger and darker. 

 Head, thorax legs and antennae dark ochreous, the head somewhat 

 reddish ochreous with the anterior fourth or so reddish brown. 

 Mandibles ferruginous, the masticatory margin black. Abdomen 

 dirty ochreous, becoming increasingly darker or yellowish brown 

 towards the apex, the apical margins of all the segments pale. 

 Sculpture and pilosity like that of emarginatus. Head also like that 

 of emarginatus, but a little narrower in front and the sides more 

 convex, the posterior margin moderately concave, the posterior 

 angles rectangular and very narrowly rounded. The clypeus is 

 convex transversely , feebly concave lengthwise over the anterior 

 third, produced in front into a lobe, the anterior margin of which 

 is convex and indistinctly crenulate. Mandibles shining, very strongly 

 punctured, less convex externally than in emarginatus, armed with 

 6 sharp teeth. The scapes fall short of the hind margin by as much 

 as two-thirds of the length of the 1st joint of the flagellum. Pro- 

 notum more convex transversely than in emarginatus. Mesonotum 

 only a trifle wider than long, the pro-mesonotal and meso-metanotal 

 sutures well defined, the meta-epinotal suture very feeble. The 

 metanotum is about twice as wide as long. Dorsum of epinotum 

 very little longer than wide, convex lengthwise and transversely, 

 joining the equally long declivity in a very wide and obtuse angle. 

 Anterior face of the scale convex, the posterior face flat, the dorsal 

 edge convex transversely and trenchant. Tibiae cylindrical, with a 

 few short setae below. 



§ media. 7-5-8-2 mm. Almost as large as the %, but having the 

 head more like that of the § minor. It is however, slightly widened 

 anteriorly in front of the eyes, not parallel-sided. The metanotum 

 is as large and as well defined as in the %. The scale is much 

 thicker than in the § minor, the anterior face very convex. Other- 

 wise like the £ minor. 



y minor, 4*7-5 mm. Very similar to the £ minor of emarginafus 

 but larger. Sides of the head, in front of the eyes, parallel. Cly- 

 peus subcarinate, the anterior margin slightly produced and angular 



