508 Annals of the South African Museum. 



arborea, Mayr, race melanogaster, Emery. ■ 



Ann. Soc. Ent. France, vol. 63, p. 29, g , $ , 1895. 



$ . 4 - 6-5*5 mm. Head, thorax and petiole bright red, abdomen 

 black, antennae and legs dark reddish-brown, the tarsi and articula- 

 tions of the legs paler. Exserted pilosity sparse, fairly long, present 

 only on the clypeus, pi-onotum, petiole and margins of the abdominal 

 segments. Decumbent pubescence long and sparse all over except on 

 the flagellum and, abdomen. Head dull, strongly, closely and longi- 

 tudinally rugoso- striate, the striations strongest near the anterior 

 margin. Mandibles longitudinally striate, 4-dentate. Thorax dull, 

 coarsely and irregularly rugose above, the rugae chiefly longitudinal 

 on the mesonotum and dorsum of the epinotum, the spaces between 

 the rugae roughened ; the rugae are coarsest on the epinotum. The 

 sides of the thorax longitudinally rugose, the rugae fairly regular and 

 close together. Declivity of epinotum shining and fairly smooth, or 

 with only one or two feeble rugae. Nodes of petiole closely and 



Fig. 39. — arborea, Mayr, race melaiiogaster, Emery. 



longitudinally rugoso-striate, except the dorsal face of the 1st node, 

 which is smooth and slightly shining. Abdomen smooth and moderately 

 shining, the basal half of the 1st segment duller and very finely 

 rugulose in the middle. Head, excluding the mandibles, about one- 

 seventh wider than long, widest behind the eyes, but not much wider 

 behind than in front. The eyes are large, convex and placed behind 

 the middle of the sides. The scape extends well beyond the occipital 

 margin ; club 3-jointed, all the joints of the flagellum longer than 

 wide. The pronotum has a distinct subangular and marginate boss on 

 each side behind. The pro-mesonotal suture is wide, much wider 

 than in tricolor and other races of casta.nea. Median tubercle of the 

 mesonotum feeble. The mesonotum is one-third longer than wide at 

 the base, feebly marginate at the sides posteriorly, and seen from the 

 side clearly convex, the posterior half or thereabouts sloping down- 

 wards to the deep meso-epinotal suture. The dorsum of the mesonotum 

 is plainly higher than that of the epinotum. The latter is fairly flat 

 and not much wider at the apex than at the base, much less rhomboidal 

 than in castanea and races. Epinotal spines thin, acute, not very 

 divergent (much less than in castanea), nearly three times as long as 



