6. Anal grooves faint or obsolete. 

 Festoons absent, Spiracular plates 



roiind or oval, c^ very small 7 



Anal grooves distinct. Festoons 

 present. Spiracular plates with 

 a taiL-like protrusion. d& 



noderate size JIHIFICEPHAIUS 



Figures 2^0 to 316 



7. Palpi ridged dorsally and lateraL- 

 ly. dtf with normal legs. (Common 

 chiefly on domestic cattle and 



equines ) BOOPHIIUS 



Figures 104 to 119 



Palpi not ridged and somewhat more 

 elongate, c^ with massive, beady 

 leg segments. (Rare in Sudan, known 



only from giraffes ) .MARGAROPUS 



Figures 236 to 239 



8. Scutum without colored ornajnentation. 

 CS5' with adeinal and subanal shields. 

 Palpal segment 2 at least twice as 

 long as segment 3. Festoons ir- 

 regular, partially coalesced HYALCMIA 



Figures 158 to 211 



Scutum with colored ornamentation*. 

 d& without adanal or subanal shields . 

 Palpal segment 2 less than twice as 

 long as segment 3. Festoons regular, 



not coalesced . AMBLYdlMA 



Figures 64 to 95 



*Ornamentation is often not extensive in the elephant tick, A. 

 tholloni . Ornamentation may be more or less faded in poorly~pre- 

 served specimens . 



- Ul - 



