A Monograph of the Formicidae of South Africa. 143 



The petiole is almost three times as wide as long ; the lateral 

 margins are considerably raised, so that the dorsal surface of the 

 petiole is strongly concave transversely ; it has also a median 

 longitudinal impression. The sides of the petiole are moderately 

 convex. The stipites are broadly truncate and rounded apically, 

 their ventral margins are concave along the apical half ; the internal 

 paramera are rounded at the apex, and at about one-third of their 

 length from the apex there is on each side above a flattened and 

 rather spatulate tubercle, directed outwards and slightly backwards ; 

 below these, on the ventral margins of the paramera, and nearer the 

 apex, there is a minute, acute triangular tooth on each side. The 

 sub-genital plate is bifurcate, with the arms directed outwards at 

 the apex and fimbriated for about half their length. The femora 

 are round and thin at the base, strongly clavate apically. Wings 

 clear, but slightly browned along the outer margins of the anterior 

 pair, the nervures and stigma black ; the wings are long, extend- 

 ing beyond the apex of the abdomen. 



The tubercles and teeth on the internal paramera are sufficiently 

 distinctive of this species, which I am inclined to think will even- 

 tually prove to be the $ of either eugeniae or rotunclatus, the only 

 species which are common in the neighbourhood of Bulawayo. 



Habitat, Bulawayo. One specimen taken at light. In my collection . 



A. decolor, Mayr. 

 Verh. Zool. Bot. Ges. Wien, vol. 28, p. 668, £ , 1878. 

 " Head smooth and without frontal sulcus. The very short declivity 

 is separated from the dorsum of the epinotum by a sharp semicircular 

 ridge. All the joints of the flagellum at least a little longer than 

 wide. The mandibles longitudinally striate, smooth near the masti- 

 catory margin. The sides of the meso- and metathorax longitudinally 

 rugose. Eusty red ; antennae, abdomen, and legs yellow. Length 

 33 mm." 



Sub-Family DOLICHODEKINAE. 



The members of this sub-family are only likely to be confused 

 with those of the Camponotinae, from which they may be distin- 

 guished by having the anal orifice transverse, and not circular. The 

 petiole is 1-jointed, and the node, in all our South African species 

 is small and much less conspicuous than in any of the Camponotinae. 

 All our species are also very soft-bodied ants, the skeleton being but 

 slightly chitinized. 



