580 Annals of the South African Museum. 



(2) 7. Epinotum not very convex or gibbous, not higher than the meso-meta- 

 notum ; ^ $5 all of the same size, excepting some which are used as honey- 

 storage vessels and have the abdomen artificially distended, (sub-genus 

 Anoplolepis). 



(11) 8. Scapes barely extending beyond the hind margin of the head; the head 



as wide as long, only in the smallest workers a trifle (l/10th) longer 

 than wide. 

 (10) 9. Mesonotum wider than long; colour more or less ochreous 



Trimeni, Forel. 

 (9) 10. Mesonotum longer than wide; colour dark brown Macgregori^ Arnold. 

 (8) 11. Scapes extending beyond the hind margin of the head by at least one- 

 fifth of their length; head at least one- sixth longer than wide. 



(13) 12. Sculpture of head and thorax distinct, reticulate-punctate 



deceptor, Arnold. 



(12) 13. Sculpture feeble, merely rugulose. 



(15) 14. Fairly shining; colour and pilosity black . . melanaria, Arnold. 



(14) 15. Dull; colour and pilosity more or less ochreous 



Trimeni, var. karrooensis, Arnold. 

 (1) 16. Metanotum at least half as long as the mesonotum. 

 (28) 17. Metanotum very prominent, separated from the mesonotum by a deep and 

 wide concavity, and from the epinotum by a strong suture, (sub genus 

 Anacantho lepis). 



(21) 18. Scapes extend beyond the hind margin of the head by at least one-fourth 



of their length. 

 (20) 19. Scapes extend beyond the hind margin by about four-fifths of their length ; 



thorax black . . . . . . Deweti, Forel. 



(19) 20. Scapes extend beyond the hind margin by a little more than one-fourth 



of their length; thorax testaceous 



Van den Kelleni, Forel, race polita, Sants. 

 (18) 21. Scapes much shorter. 



(23) 22. Head and thorax dull; the scape barely extends beyond the hind margin 



of the head ..... Van den Kelleni, Forel. 



(22) 23. Head and thorax shining, or at least not quite dull; scape longer. 



(25) 24. Colour entirely black ..... Jonberti, Forel. 



(24) 25. Colour partly red or yellow. 



(27) 26. Head and thorax only slightly shining 



Van den Kelleni, var. tricolor, Forel. 



(26) 27. Head and thorax very shining . . . decora, Santschi. 

 (17) 28. Metanotum not very prominent, separated by narrow sutures from both 



the meso- and the epinotum ; or, if the meso-metanotal suture is large, then 

 the metanotum is not prominent (Brunni). (sub-genus Plagiolepis s.str.). 



(34) 29. Meso-metanotal and meta-epinotal sutures moderately distinct. 



(33) 30. The scape extends beyond the hind margin of the head by at least one- 

 fifth of its length. 



(32) 31. Meta- and epinotum transversely rugulose and dull; meso-metanotal suture 

 not deep . . . pygmaea, var. bulawayensis, Arnold. 



(31) 32. Meta- and epinotum smooth and shining; meso-metanotal suture deep 



pygmaea, var. intermedia, Emery. 



