A Monograph of the Formiciclae of South Africa. 487 



(13) 16. First joint of petiole not bidentate behind; 2nd node with a feeble 

 median groove ; epinotum with very small teeth 



constructor, Emery. 

 (8) 17. First joint of petiole more or less trapezoidal, widest in front. 



(19) 18. Second node of petiole much wider than long and clearly wider than 



the 1st ; whole body very polished and shining Santschii, Forel. 



(18) 19. Second node of petiole not wider, or very little wider than long. 



(29) 20. Second node of petiole without a median longitudinal groove, entire 



or only slightly emarginate behind ; pronotum sharply marginate at 

 the sides, at least on the posterior half. 

 (28) 21. Dorsum of epinotum not deeply impressed longitudinally in the 

 middle ; mesonotum without a wide transverse impression on each 

 side behind the median tubercle ; seen in profile, the mesonotum is 

 not raised above the level of the pronotum. 



(23) 22. Pro-mesonotal suture very shallow, obsolete or nearly so over the 



middle third . . . Kneri, Mayr, race hottentota, Emery. 



(22) 23. Pro-mesonotal suture deep and wide, at least at the sides, and fairly 

 clearly defined in the middle. 



(25) 24. Head in greater part smooth and shining ; colour more or less bright 



ochreous . . . gambiensis, Andre, var. hrantziana, Forel. 



(24) 25. Head distinctly sculptured ; colour more or less dark brown or reddish- 



ochreous. 

 (27) 26. Median carinula of mesonotum prominent and long ; colour dark 

 brown ; dorsum of epinotum rather deeply impressed in the middle 



Kneri, Mayr, var. amita, Forel. 



(26) 27. Median carinula less prominent ; colour reddish-ochreous ; dorsum of 



epinotum very shallowly impressed . . . Kneri, Mayr. 



(21) 28. Dorsum of epinotum very deeply impressed in the middle ; mesonotum 

 with a transverse and wide impression on each side behind the median 

 tubercle ; seen in profile, the mesonotum is raised above the level of 

 the pronotum . . . Kneri, Mayr, var. matabele, Arnold. 



(20) 29. Second node of petiole more or less clearly grooved longitudinally in 



the middle. 



(31) 30. Epinotum unarmed, or with very minute dentiform tubercles 



inermis, Mayr, and races. 



(30) 31 . Epinotum with distinct spines or teeth. 



(33) 32. Epinotal spines curved downwards . . . Buchneri, Forel. 



(32) 33. Epinotal spines horizontal or directed more or less upwards. 



(45) 34. Sides of pro-mesonotum not marginate, or (rarely) the sides of the 

 mesonotal declivity feebly marginate. 



(36) 35. All the joints of the flagellum as long as, or longer than wide 



Group A, q. v. infra. 

 (35) 36. At least some joints of the flagellum wider than long. 



(38) 37. Head, excepting a narrow longitudinal streak on middle of the vertex, 



dull and closely sculptured . . . Group B, q. v. infra. 



(37) 38. Head very superficially sculptured and fairly shining, at least over the 



posterior two-thirds. 

 (40) 39. Small species, 3 mm. or less ; head not reddish. . gallicola, Forel. 



(39) 40. Larger species 3-5 mm. 



