A Monograph of the Formiciclae of South Africa. 275 



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Key to the $ ^ of Tetramorium (s. str.). 



(8) 1. First node of petiole more or less squamiform. 



(3) 2. First node of petiole strongly and transversely striate ; large species, 



4"5-5 mm. . grandinode, Santschi, and var. hopensis, Forel. 



(2) 3. First node of petiole smooth ; small species, 3 mm. 



(5) 4. Second node of petiole less than twice as wide as long, its sides 



rounded ..... squami node, Santschi. 



(4) 5. Second node of petiole twice as wide as long. 



(7) 6. Sides of 2nd node, seen from above, angular ; head broAvn. 



squaininode, race do, Forel. 



(6) 7. Sides of 2nd node straight ; head dark yellow. 



squaminode, var. flaviceps, Arnold. 

 (1) 8. First node of petiole not squamiform. 



(12) 9. Eyes very small, composed of a single facet. 



(11) 10. First node of petiole considerably narrowed in front ; seen from 

 above, the anterior margin acutely convex or conical. 



subcoecum, Forel, var. inscia, Forel. 

 (10) 11. First node not much narrower in front than behind ; seen from 

 above, the anterior margin feebly convex or straight. 



Traegaordhi, Santschi. 



(9) 12. Eyes not very small, composed of several facets. 



(28) 13. Scape extending back as far as, or beyond the occipital margin.* 



(15) 14. Promesonotum smooth and shining . . laevithorax, Emery. 

 (14) 15. Promesonotum sculptured, not very shining. 



(17) 16. First node wider than long . . . Frenchi, Forel. 



(16) 17. First node longer than wide, or at least as long as wide. 



(23) 18. First node coarsely sculptiu-ed, rugoso -punctate. 



(20) 19. A demi-scrobe present . setigerum, Mayr, race quaerens, Forel. 

 (19) 20. Scrobes entirely absent. 



(22) 21. Clypeus convex transversely ; epinotal spines short, shorter than the 

 interval between their bases ; eyes not very large . Gladstonei, Forel. 



(21) 22. Clypeus flat transversely; epinotal spines long, longer 'than the 



interval between their bases ; eyes decidedly large . longicorne, Forel. 



(18) 23. First node finely sculptured, at least not rugoso-punctate. 

 (27) 24. Pronotum with at least a few longitudinal rugae. 



(26) 25. Reddish-brown; 1st node distinctly longer than wide. 



Blochmanni, Forel, race continentis, Forel. 

 (25) 26. Yellowish-red ; 1st node barely longer than wide. 



Bequaerii, Forel, race bulawayensis, Forel. 



(24) 27. Pronotum very finely reticulate only . quadrispinosum, Emery. 



(13) 28. Scapes not extending back as far as the occipital margin. 



(32) 29. Pubescent hairs on the body flattened, almost scale-like and closely 



adpressed. 

 (31) 30. First node above, nearly twice as wide behind as in front; epinotal 



spines as long as the interval between their bases. 



setuliferum, Emery 



* Jauresi, Forel, has the scapes almost reaching the occipital margin, and is 

 therefore included in the alternative series (28). 



