564 Annals of the South African Museum. 



middle and hind tibiae and femora brownish. Without sculpture 

 entirely smooth and shining. Pilosity and pubescence similar to that 

 of rubrovaria-pilosa. Very similar to that species, from which it 

 differs by the colour and the following characters. 



The head is narrower, about one-sixth longer than wide, narrower 

 in front. The 2nd joint of the flagellum is as long as wide, the 3rd 

 a trifle longer. The meso-metanotum is narrower, two-thirds longer 

 than wide, and the dorsum of the epinotum is longer and flatter, the 

 teeth blunter and smaller, merely tubercles. The scale of the petiole 

 is feebly but distinctly emarginate above. 



Redbank and Bulawayo, S. Rhodesia. 



The nest is placed in loose sandy soil in the hottest situations. 

 A very agile species. In one nest several £ £ were found which had 

 the abdomen considerably swollen (as long as the head and thorax 

 together), but not so rotund as in the repletes of Myrmecocyshts or of 

 Plagiolepis Trimeni. Probably the habit of using some of the members 

 of the colony as storage-vessels for honey is only in the incipient stage 

 in this genus. 



■si 



A. Fobeli, n. sp. (Plate VIII, fig. 121.) 



£. P6-P9 mm. Head and thorax bright red (burnt sienna), 

 abdomen dark brown, with the middle of the upper surface of the 1st 

 and 2nd segments ochreous. Front pair of legs and the scapes 

 ochreous, flagellum, middle and hind legs brownish, the tarsi ochreous. 

 Entirely dull, the head and thorax microscopically rugulose or coria- 

 ceous. Pubescence whitish, decumbent and very sparse, more plentiful 

 on the legs, head and antennae than elsewhere. Apical margins of the 

 abdominal segments with a sparse, white, fairly short and obtuse 

 pilosity. Head subquadrate, a little longer than wide, hardly narrowed 

 in front, feebly emarginate behind, the sides feebly convex. Clypeus 

 produced more forwards than in the two preceding species, hiding the 

 closed mandibles, subcarinate. Eyes placed in the middle of the 

 sides ; the ocelli vestigial as in the two preceding species. The scapes 

 just reach the posterior margin of the head; 2nd joint of flagellum 

 wider than long, the 3rd as long as wide, all the, remaining joints 

 longer than wide. Pronotum like that of pilosa, but the meso- and 

 metanotum are wider than in that race or in Arnoldi, the mesonotum 

 being almost twice as wide as long. The stigmata of the metanotum 

 only slightly prominent. Epinotum as in Arnoldi, but more concave 

 between the tubercles, not inclined upwards posteriorly but horizontal 

 or even slightly inclined downwards. The petiole is as long as the 



