A Monograph of the Formicidae of South Africa. 619 



are exhibited by this protean species. I have therefore in some 

 cases, e.g. race Liengmei Forel, given only alphabetical signs to the 

 different forms. 



Key to the species of Myrmoturba, % %. 



(24) 1. Body entirely black or dark brown*, only the petiole sometimes paler, 

 {Liengmei excepted, which has very dark ochreous spots on the abdomen). 



(19) 2. The scape extends beyond the hind margin of the head by at least as 



much as its apical width. 



(10) 3. Clypeus very obtusely, or not at all carinate. 



(5) 4. Over 15 mm. long . . . race Liengmei, Forel, var. t. 

 (4) 5. Less than 10 mm. long. 



(9) 6. Whole body fairly dull, especially the head. 



(8) 7. A coarse, bristly and white pilosity present . niveosetosus, Mayr. 



(7) 8. Pilosity thin and yellowish . . . acvapimensis, Mayr. 



(6) 9. Whole body moderately shining . . . Werthi, Forel. 

 (3) 10. Clypeus distinctly carinate. 



(12) 11. Smaller species, not more than 11 mm. long 



race negus, var. Beritschi, Forel. 



(11) 12. Larger species, more than 11 mm. long. 

 (18) 13. Head dull above. 



(17) 14. Femora more or less ochreous; the scape extends beyond the hind margin 



of the head by not more than the length of the 1st joint of the fiagellum. 



(16) 15. Abdomen black, the first 3 segments sometimes with spots of paler colour, 



but nevertheless very dark . . , race Liengmei, Forel. 



(15) 16. Apical half of femora brownish red; abdomen entirely black 



race Liengmei, var. «. 

 (14) 17. Femora black; scapes longer, almost reaching the pro-mesonotal suture 



natalensis, Smith. 



(13) 18. Head with a more or less distinct glossiness; (tibiae and apical half of 



femora black) .... maculatus, race Knysnae, Arnold. 

 (2) 19. The scape does not, or only just reaches back as far as the hind margin 

 of the head. 



(21) 20. Head very finely, but distinctly reticulate-punctate or granulate 



maculatus, race congolensis, Em.. 



(20) 21. Head very finely rugulose and slightly shining. 

 (23) 22. Head a little wider than long, the sides convex 



maculatus, race Empedocles, Forel. 



(22) 23. Head longer than wide, the sides straight, except over the anterior third 



maculatus, race Thales, Forel. 

 (1) 24. Thorax, or at least the epinotum and petiole, neither black nor very dark 

 brown, but of some shade of a reddish, ochreous or pale brownish colour. 

 Abdomen spotted with ochreous or the base more or less pale. 

 (32) 25. Not more than 12 mm. long. 

 (29) 26. Head neither black nor brown. 



* Excepting the mandibles, apical margin of the clypeus, the lower part of the 

 sides of the thorax, and the extreme apical margin of the abdominal-segments. 



