742 Annals of the South African Museum. 



(9) 2. Whole body fairly dull. 



(4) 3. More than 12 mm. long ; pubescence on the thorax very dense, pale 



golden or grey, hiding the sculpture . . . militaris, Fab. 



{3) 4. Less than 12 mm. long ; pubescence on the thorax less dense. 

 (8) 5. Pubescence greyish. 

 (7) 6. Pubescence long, hiding the sculpture of the head and thorax 



schistacea, Gerst. 

 (6) 7. Pubescence shorter, not hiding the sculpture 



schistacea, race rugulosa, Mayr. 



(5) 8. Pubescence distinctly silvery . . schistacea, race Schluteri, Forel. 

 (2) 9. At least the abdomen very shining. 



(13) 10. Head and thorax subopaque. 



(12) 11. Eyes flat .... schistacea, race gagates, Smith. 



(11) 12. Eyes moderately convex . . schistacea, race indefinita, Forel. 



(10) 13. Head moderately shining, thorax and abdomen very shining 



indefinita, var. acheron, Arnold. 



(1) 14. Smaller species, less than 8 mm. long; pronotum with teeth which are 



rarely more than one and a half times longer than their basal width, and 



always much shorter than the portion of the pronotum which lies behind 



them. 



(22) 15. Abdomen dull, without pilosity. 



(17) 16. The inner pair of spines on the petiole much shorter than the outer pair 



viscosa, Smith. 

 (16) 17. The inner pair of spines on the petiole longer than the outer pair. 



(19) 18. Abdomen and thorax very distinctly longitudinal striate ; the inner pair 



of spines on the petiole thinner than, but only a little longer than, the 

 outer pair . . .... Arnoldi, Forel. 



(18) 19. Abdomen reticulate. 



(21) 20. Thorax strongly and longitudinally rugoso-striate, not much wider in 

 front than behind ; meso-epinotal suture distinct ; pronotal teeth a little 

 longer than their basal width .... spinicola, Forel. 



(20) 21. Thorax finely reticulate -punctate, much wider in front than behind ; 



meso-epinotal suture nearly obsolete ; pronotal teeth shorter than their 

 basal width . . . cubaensis, Mayr, race durbanensis, Forel. 



(15) 22. Abdomen shining, with a fairly abundant and long pilosity 



Revoili, Andre. 



Cubaensis Mayr i. sp., and its race gallicola Forel, are not included 

 in the key above, being unknown to me in nature. P. Gamaii 

 Santschi is also excluded, only tlie $ being known. 



P. schistacea, Gerstaecker. 



Monatsb. Akad. Wiss. Berlin, p. 262, & 1858. 



& 7-5-9 mm. Black, dull. Clothed all over with a dense, decum- 

 bent and fine cinereous pubescence, which, on the head and thorax, 



