28 Annals of the South African Museum. 



Mayrian furrows well defined, and with a short shallow groove 

 between the fork. Scutellum triangular, very gibbous and seen 

 from the side, much higher than the mesonotum. Epinotum as 

 long as the meso- and metanotum together, the dorsum is sloping 

 and moderately convex ; the declivity is short and gradual, excavated 

 dorso-ventrally, shining and bounded by a raised margin all round. 

 Petiole long, two and a half times as long as wide, widest a little 

 before the apex, the extreme base is angularly emarginate above, 

 with the angles raised into two small flaps. Seen from the side, the 

 petiole is convex above and concave below. The ventral lamella is 

 produced into a small blunt angle at the extreme base. First 

 abdominal segment almost triangular, the apical margin is quite 

 four times as wide as the basal. 2nd abdominal segment is as long 

 as the 1st, wider than long and moderately convex at the sides. 

 Pygidium sub-acute. The apical third of the posterior wings, and 

 two-thirds of the anterior wings externally, dark fuscous ; stigma 

 and nervures dark brown. Legs long and slender. 



Hab. S. Ehodesia. The nest of this species is so distinctive that 

 it cannot be mistaken for that of any of our other Ponerinae. The 

 entrance is surmounted by a dome, from 6 to 8 inches high, by 

 about 12 inches broad at the base. The dome is built up of very 

 even-sized small pebbles, about 5 to 8 mm. in their largest diameter. 

 The entrance is situated in the centre above, and this is generally 

 the only entrance, very exceptionally there may be a smaller and 

 less regular opening at the base of the mound. The type form 

 appears to be replaced entirely throughout S. Ehodesia by this race. 

 (G.A., S.A.M., P.M. colls.) 



P. Aenoldi, Forel. 

 Deutsch. Bnt. Zeitschr. Beiheft, p. 206, $ , 1913. 



£ . 12-13 mm. Black, mandibles castaneous red. At first glance 

 this species is not unlike laviellosa, especially var. rhodesiana of the 

 race longinoda. It can, however, easily be distinguished from those 

 three forms by the structure of the dorsum of the mesonotum, 

 which is as high as the epinotum, and not on a lower level as in 

 those forms. The 2nd segment of the abdomen is longer than 

 wide, and is not wider than the 1st, whereas in laviellosa the 

 2nd segment is wider than the 1st, and distinctly wider than long, 

 and the inter-segmental constriction is much more pronounced. 



The apex of the abdomen clothed with rufous hairs, otherwise 

 the pubescence and pilosity as in laviellosa, var. rhodesiana. As 

 in the latter, the whole body is microscopically rugulose, but the 



