A Monograph of the Formicidae of South Africa. 75 



of the middle pair of legs short ; the 1st joint of the tarsus with 

 stout hairs or bristles on the dorsal surface. 



$ . Abdomen with a distinct constriction between the 1st and 

 2nd segments. Pygidium produced into a sharp point. 



E. (Trachymesopus) Wroughtoni, Forel. (Plate II., fig. 18.) 

 Eev. Suisse Zool., vol. 9, p. 341, £ $ , 1901. 



$ . 5-5*3 mm. Head, thorax above excepting the mesonotum, 

 petiole and dorsal portion of 1st and 2nd abdominal segments, dark 

 brown. Mesonotum and ventral surface of abdomen reddish brown. 

 Third, 4th, and 5th abdominal segments rusty yellow. The sides of 

 the head castaneous. Antennae, mandibles, margins of pronotum, 

 meso- and metapleurae and legs more or less ferruginous, the tarsi 

 paler. Clothed all over with a fine golden pubescence. The pilosity 

 consists of fairly long flavous hairs, evenly distributed. Head and 

 thorax dull, abdomen slightly shining, declivity of epinotum and 

 both faces of the petiole very shining. 



Scape, head, and thorax very finely, closely and shallowly 

 punctured. Abdomen exceedingly finely punctured. Neck of pro- 

 notum transversely rugulose. Head, excluding the mandibles, 

 nearly quadrate or slightly longer than wide, sides moderately convex, 

 posterior angles rounded, posterior margin shallowly emarginate. 

 Clypeus short, sub-truncate anteriorly, raised and carinate in the 

 middle. Mandibles finely striated, with a few coarse punctures on 

 the masticatory margin, a long groove on the external margin, and 

 an. elongate fovea near the basal margin; the masticatory margin 

 furnished with about 9 blunt teeth. Frontal carinae extend a little 

 beyond the level of the posterior margin of the eyes. The latter 

 small and flat, situated within the anterior third of the head, and 

 separated from the anterior margin by a distance equal to their own 

 length. Scape of antennae reaches back almost to the occiput ; 

 flagellum one-third longer than the scape ; 3rd to 10th joints wider 

 than long. 



Pronotum rounded, with a distinct neck, and one and a half 

 times as long as the mesonotum. The latter wider than long. 

 Dorsum of epinotum round above ; one and two-thirds as long as 

 the mesonotum. The declivity rather steep, the margins slightly 

 raised, especially above. Node of petiole in front convex from side 

 to side, slightly concave dorso-ventrally, and concave behind. The 

 summit a little flattened, the anterior and posterior faces do not 

 meet laterally in such a sharp edge as in sennaarensis. The 



