A Monograph of the Formicidae of South Africa. 557 



(36) 37. Head narrower in front than behind ; a little less than half the scape 



extends beyond the back of the head. 

 (39) 38. Lateral profile of the dorsum of the epinotum very convex, scale of 



petiole thick ...... egregia, Forel. 



(38) 39. Lateral profile of dorsum of epinotum straight and inclined upwards 



posteriorly ; scale thinner . capensis, Mayr, var. validiuscula, Emery. 

 (35) 40. The scape extends beyond the back of the head by very little more 



than one-third of its length. 



(42) 41. Metathorax and epinotum fairly dull, rugulose or reticulate; scale 



bidentate . . . . . capensis, Mayr. 



(41) 42. Metathorax and epinotum shining. 

 (44) 43. Length 2 - 4-2'8 mm. ; scale emarginate above 



capensis, Mayr, race simplex, Forel. 



(43) 44. Length 2 mm. ; scale more deeply emarginate, or almost bidentate 



capensis, race laevis, Santschi, var. Alexis, Arnold. 



The above key does not include capensis, race Junodi, and var. 

 simplicoides, Forel, and simplex, var. minuta, Forel, which are not 

 known to me in nature. 



A. spinosioe, Forel. 



Ann. Soc. Ent. Belg., vol. 57, p. 144, £ , 1913. 



$ . 2*7-3 mm. Head, thorax and petiole dark rusty red (dark 

 burnt sienna), the head somewhat darker than the thorax, abdomen 

 dark brown, becoming paler or rusty red towards the base ; the basal 

 segment sometimes pale all over except the sides. Legs yellowish-red, 

 nagellum brown and darker at the apex, scapes dark ochreous, becoming 

 gradually darker towards the apex. Pubescence very fine on the legs 

 and scapes, very sparse on the thorax and abdomen, absent from the 

 head. Abdomen with suberect, thick and bristly brownish-black hairs, 

 elsewhere the pilosity is wanting. Head, thorax and petiole dull, very 

 closely finely and evenly reticulate-punctate. Abdomen moderately 

 shining. Mandibles very finely striate, feebly shining, with three or 

 four acute teeth. Head, excluding the mandibles, nearly one-fourth 

 longer than wide, ovoid, considerably narrowed in front, the posterior 

 margin straight. Eyes large, placed in the middle of the sides. 

 Ocelli much reduced, just visible under a high magnification. Clypeus 

 very convex transversely, subcarinate in the middle. Scapes extend- 

 ing beyond the back of the head by two-fifths of their length ; 

 second joint of flagellum one and a-half times longer than wide, all 

 the other joints much longer. Pronotum somewhat flattened above, 

 the sides fairly convex, two-fifths wider than long in the middle. 

 Mesonotum subcircular, a little wider than long, half as wide as the 



