A Monograph of the Formicidae of South Africa. 613 



6. Sub-genus MYRMOSERICUS, Forel. 



Type C. rufoglaucus Jerdon. Identical with Myrtnolurba but 

 entirely dull, very finely sculptured, with a silky sheen and more or 

 less covered with a fairly abundant pubescence on the whole body, 

 especially the abdomen. 



7. Sub-genus MYRMOSAGA, Forel. 



Type C. quadrimaculatus Forel. Dorsum of epinotum concave, 

 saddleshaped, the rest of the thorax convex, not marginate. Smallish 

 species, generally shining. Shape generally like that of Myrmoiurba, 

 but more robust. The clypeus carinate and with a short lobe. 

 Mandibles usually with 6 teeth. 



8. Sub-genus MYRMAMBLYS, Forel. 



Type C. fasiigatus Roger. Head subtruncate in front, mandibles 

 thick, clypeus high and narrow, the lateral pieces obsolete or nearly 

 so. The Q major and ^ minor strongly dimorphic, but the former 

 do not constitute a distinct Qj. caste. Living in hollow stems and 

 trunks of trees, the ^ major guarding and closing the entrances to 

 the nest with their subtruncate heads. 



9. Sub-genus COLOBOPS1S, Mayr. 



Type C. truncalus Spin. (Characterised by its strong dimorphism). 

 The Qj. has the head sharply truncate in front and nearly always 

 with the truncate area bounded by a sharp raised margin. The 

 clypeus is usually continued behind past the truncate area, thus 

 forming an angle with its anterior portion. The Qj. acts as a janitor, 

 closing the entrance to the nest with the truncated face of the head. 

 Some species have the thorax excised (i. e. at the meso-epinotal suture). 

 The species live in the wood of trees, in stems, galls and hollow spines. 



10. Sub-genus MYRMOTREMA, Forel. 



Type C. foraminosus Forel. The 9 an d Q major with the anterior 

 part of the head abundantly pitted. Clypeus usually without lobe 

 or carina, mandibles usually G-dentate. Thorax not marginate, convex 

 in front, narrowed behind. Entirely African. 



11. Sub-genus ORTHONOTOMYRMEX, Ashmead. 



Type G. lateralis 01. Epinotum cuboid, wide, distinctly marginate, * 

 usually with a distinct angle between its two faces. Thorax usually, 

 but not always emarginate between the mesonotum and the epinotum. 



* Not in all our species. 



