11. Scuteil punctations either excessively- 

 rare or in a pattern of four more or 

 less linear rows (sometimes with one 

 or two partial additional rows); among 

 these interstitial or secondary puncta- 

 tions are present or absent, if present 



they are smaller and more superficial* 12 



Scutal punctations not in these patterns, 



rather dense, not separated into primary 



and interstitial punctations but uniform 



or mixed. (Uncommon southern species) 16 



12. Scutum impunctate or with excessively- 

 few, shallow punctations. Adanal 

 shields typically tending towards 

 sickleshape but quite variable in 

 series from single hosts. Postero- 

 median and paramedian grooves pres- 

 ent or absent. Lateral grooves 

 distinct or indicated only by a row 

 of punctations. Coxa I \ri.th a small 

 dorsal projection which may be much 

 reduced. (Small, rare, pear shaped, 

 variable species, confined to cane 



rats) R. SIMPSONI 



Figures ^97 and 29S 



Scutiim with more, larger, and deeper 



punctations. Other combinations of 



characters differing 13 



*The linear punctation pattern of heavily punctate specimens of 

 R. _s. sanguineus in southern Sudan may be somewhat obscured by 

 "Sense, moderately large interstitial punctations, but can be 

 discerned by turning the specimen obliquely to the source of the 

 light. 



- 589- 



