556 Annals of the South African Museum. 



(8) 7. Head and thorax more or less yellowish-red., abdomen pale, at least at 

 the base . . . . . . spinosior, Forel. 



(7) 8. Head and thorax piceous, abdomen wholly black 



spinosior var. natalensis, Arnold. 



(6) 9. Spines of node flattened from front to back, as thick at the apex as at 

 the base .... spinosior, var. ballaensis, Arnold. 



(1) 10. Node of petiole only bidentate or emarginate above ; if bidentate, then 

 the teeth are much shorter than the width of the node. 



(24) 11. Small species, 2*2 mm. or less ; body not entirely black or dark brown. 



(19) 12. Whole body very smooth and shining. 



(18) 13. Thorax more or less ferruginous, head and abdomen dark brown. 



(15) 14. Scapes and tibiae pubescent only . . . rubrovaria, Forel. 

 (14) 15. Scapes and tibiae with exserted pilose hairs in addition to the pube- 

 scence. 



(17) 16. Head dark brown _ . . . rubrovaria, race pilosa, Forel. 



(16) 17. Head ferruginous . rubrovaria, race pilosa, var. avunculus, Arnold. 

 (13) 18. Dark reddish- ochreous, apical third of abdomen blackish 



Arnoldi, Forel. 

 (12) 19. Whole body dull. 



(21) 20. Epinotum straight between the tubercles, which are almost obsolete 



Foreli, Arnold, var. convexa, Arnold. 



(20) 21. Epinotum concave between the tubercles, which are well developed. 

 (23) 22. Mesonotum feebly convex transversely, the meta-epinotal suture 



shallow . . . . . , . Foreli, Arnold. 



(22) 23. Mesonotum strongly convex transversely, the meta-epinotal suture 



deep ■ . . . . . Foreli, var. impressa, Arnold. 



(11) 24. Larger species, more than 2 - 2 mm. long; body entirely or in greater 

 part black or dark brown. 



(28) 25. Head and thorax with a greenish abdomen with a violaceous metallic 



lustre ; dorsum of epinotum with a deep median longitudinal groove. 

 (27) 26. Head and pro-mesonotum shining . . submetallica, Arnold. 



(26) 27. Head and pro-mesonotum dull submetallica, var. aspera, Arnold. 



(25) 28. Body withoiit any metallic lustre. 



(32) 29. Epinotum very coarsely and irregularly rugose; pilosity long and 



white. 

 (31) 30. Smaller species, 2'4 mm. ; scape extending beyond the back of the 



head by one-fourth of its length . . . crinita, Mayr. 



(30) 31. Larger species, 2 - 6-3"3 mm. ; scape extending beyond the back of the 



head by nearly one-third of its length 



hirsuta, Santschi, var. elevata, Forel. 



(29) 32. Epinotum finely sculptured ; pilosity not white. 



(34) 33. Large stout species ; head and thorax closely and finely sculptured 

 and dull ...... silvicola, Arnold. 



(33) 34. More slender species ; head and thorax more or less smooth and shining. 

 (40) 35. The scape extends beyond the back of the head by nearly half its 



length, or more. 

 (37) 36. Head not narrower in front than behind ; the scape extends by more 

 than half its length beyond the back of the head 



egregia, Forel, race Santschii, Arnold. 



