. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. A Monograph of the Formicidae of South Africa. 403 TiiiBE CATAULACINI. Catauxacus inteudens, Smith, var. intermeditjs, Santschi. Ann. Soc. Ent. France, vol. 85, p. 287, £, 1916. " $ . 4-2-4-5 mm. long, tlie head deflected. Dull. Sculpture a little stronger than in intrudens, Smith, but much less pronounced than in rugosus, Forel, and C. Bequaerti, Forel. The rugae on the head are further apart (about 13 between the eyes), and the transverse rugae form a more distinct reticulation. The declivity
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. A Monograph of the Formicidae of South Africa. 403 TiiiBE CATAULACINI. Catauxacus inteudens, Smith, var. intermeditjs, Santschi. Ann. Soc. Ent. France, vol. 85, p. 287, £, 1916. " $ . 4-2-4-5 mm. long, tlie head deflected. Dull. Sculpture a little stronger than in intrudens, Smith, but much less pronounced than in rugosus, Forel, and C. Bequaerti, Forel. The rugae on the head are further apart (about 13 between the eyes), and the transverse rugae form a more distinct reticulation. The declivity of the epinotum (apart from a few transverse striae between the spines) and the anterior face of the 1st node are smooth. The longitudinal sulci on the petiole more regular. The abdomen punctured, also fairly sharply striate at the base and slightly so at the apex. Pilosity white, intermediate in quantity and length between G. Bequaerti and intru- dens. Head a little less narrowed in front than in intrudens, more than in Bequaerti, relatively smaller than in those two species, with the hind margin straight. Thorax as elongate as in Bequaerti, but with the sides dentate as in intrudens. ' The spines are closer together, more clearly parallel and as acute as in intrudens. First joint of the petiole subcorneal as in the latter species, with the upper face smooth and very oblique in front. Second joint as wide as the 1st, with a fairly distinct median groove on the anterior and upper faces. Abdomen a little less convex than in intrudens, a little more than in Bequaerti. Colour as in those ; Bembesi, S. Rhodesia. (, , colls.) Genus CATAULACUS. I have endeavoured to draw up a key to the six forms which I have seen, but in view of the trifling distinctions on which authors have seen fit to erect new species in this genus, too much reliance should not be placed on it. In fact, a review of these six forms leads me to the belief that we have only two nuclei
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