A Monograph of the Formicidae of South Africa. 131 



behind, and the clypeus projects considerably forwards, the 

 puncturation and pubescence is also more pronounced. 



? . 50 mm. Head 4 mm. long x 5 mm. wide; thorax 6*5 mm. 

 long; abdomen 30 mm. long; free portion of hypopygium 7 mm. 

 long. Head, thorax, petiole and dorsal surface of abdomen ferru- 

 ginous, ventral surface of abdomen and legs, ferruginous-flavous, 

 hypopygium castaneous ; node and 1st abdominal segment some- 

 what darker. Head a little wider than the posterior margin of the 

 petiole, much wider than the thorax, wider than long. Sides of the 

 head sinuate in the middle, occipital margin widely but shallowly 

 emarginate. A deep median groove extending from the posterior 

 angle of the clypeus to the occiput, divides the dorsum of the head 

 into two halves. The anterior face of the head, above the antennal 

 sockets, moderately excavated. Clypeus flat, with a slight emargina- 

 tion in the middle of the anterior margin, angularly produced behind 

 between the frontal carinae. The latter are tumid and not distinct. 

 The antennae do not reach the occipital margin ; the scape as long 

 as the flagellum. The latter 10-jointed, the 1st joint slightly longer 

 than broad, the 2nd-9th joints wider than long, the apical twice as 

 long as wide. Mandibles about three-fifths as long as the head, 

 curved inwards, the inner edge bounded by a raised line, the apex 

 acuminate. Dorsum of thorax rather flattened, the sides of the 

 pronotum rounded, of the meso- and metanota sloping inwardly. 

 Epinotum a little wider than the pronotum, the declivity obsolete. 

 The petiole is roughly semicircular, the anterior margin sinuate, the 

 lateral angles considerably rounded ; anteriorly there is a slight 

 median impression above ; the posterior margin is convex, except 

 laterally behind the posterior angles, where there is a concavity on each 

 side. The posterior angles of the node are prominent, the apices 

 obtuse. Pirst-3rd abdominal segments sub-equal in length, 4th 

 and 5th sub-equal, both slightly longer than the 3rd, all the 

 segments wider than long. The hypopygium differs very consider- 

 ably from that of helvolus. The median apical incision is indeed so 

 deep that, when seen from above, the organ may be described as 

 consisting of a short basal portion, carrying two lateral projections 

 which curve downwards and slightly inwards, and are rapidly 

 narrowed towards their apices. The upper surface of these 

 projections are longitudinally hollowed out, the external edge of the 

 excavations so formed being less sharp than the internal. The 

 left-hand fork or projection has at its base a smaller excavation, 

 which is only feebly indicated in the right-hand fork. All the 

 legs have 5 joints to the tarsi, these are shorter than the tibiae. 



