38 Annals of the South African Museum. 



Genus CENTROMYRMEX, Mayr. 

 Verh. Zool. Bot. Ges. Wien, vol. 16, p. 894, 1866. 

 Spalacomyrmex, Emery, Ann. Mus. Stor. Genova, vol. 27, p. 189, 

 1889. 



Characters. 



£ . Clypeus projecting far backwards between the frontal carinae ; 

 the latter expanded in front, not close together, and with a long 

 sulcus between them. 



The scape of the antennae is rather flattened, the flagellum 

 incrassate towards the apex. Eyes absent. 



Mandibles long, the masticatory margin unusually so, with fine 

 denticulations or without teeth. 



Pro-mesonotal suture distinct, meso-epinotal suture obsolete. 



Pronotum sharply marginate in front, the part below the margin 

 almost vertical. The dorsum of the epinotum is contracted at its 

 base so as to form a median saddle-shaped ridge, and is raised into a 

 hump towards the apex above the declivity. 



Node of petiole somewhat conical, with a fine sharp spine beneath. 

 Abdomen ovate. 



Legs very short and stout, the femora and tibiae broad and flat. 

 Posterior tibiae with two calcaria, the inner pectinate, the outer 

 simple ; middle tibiae with two simple calcaria. 



$ . Similar to the $ but winged, slightly larger, with medium- 

 sized eyes placed nearly in the middle of the sides of the head ; 

 small ocelli present, situated close to the occiput. 



$ . Head rounded, the clypeus very convex. Mandibles short, 

 triangular and edentate. Thorax rather short, the mesonotum with 

 Mayrian furrows. Epinotum very convex. Node of petiole emar- 

 ginate above. Abdominal constriction feeble. Pygidium not pointed. 

 Wings short, not reaching the end of the abdomen. Calcaria of 

 middle tibiae simple and small ; posterior tibiae with two calcaria, 

 the inner pectinate. 



C. Constanciae, n. sp. (Plate II., figs. 14, 14a, 146, 14c.) 



£ . 5-5 - 3 mm. Dark reddish yellow, posterior half of head, 

 anterior portion of pronotum, mesonotum, and epinotum above, the 

 basal half of the abdominal segments, apices of the joints of the 

 flagellum, except the apical, and the anterior tarsi, castaneous. 



There is no pubescence, and the whole body is very smooth and 

 shining. Sides and posterior part of the head with very distinct 

 small punctures ; scape and frontal carinae and the central portion 



