II. Species in which only females are foimd on the hosts, 

 and in which males may or may not be knovm. 



Althoiigh the males of species confined to the Ethiopian Faunal 

 Region (except Ixodes nairobiensis Nuttall, 1916 and I. hoogstraali 

 Arthur, 1955) are known, their habits are still obscure. 



The genus Ixodes has been reviewed by Nuttall and Warburton 

 (1911), to which important additions have been made by Nuttall 

 (19130,1916). The African representatives of this genus are re- 

 viewed by Arthur (ms.), who also proposes a number of new species. 



Careful examination of rodents and other small animals, and 

 of dogs and other domestic animals will probably reveal other spe- 

 cies in the Sudan, especially on the west bank of Ekjuatoria Prov- 

 ince. Search in rodent nests, animal lairs, and bat caves and 

 retreats shoiiLd prove fruitful. 



No African Ixodes has been reported to transmit human disesises, 

 but at least Ixodes cavipalpus and I. rasus are known to bite man. 

 In southern Africa, I. rubicundus is an important cause of tick 

 pareilysis of sheep. "l. pilosus , to which this condition is most- 

 commonly attributed in literature , plays no known role in this 

 affliction; early misidentification was the cause of this frei- 

 quently quoted misstatement (Theiler, correspondence). 



KE? TO SUDAN SPECIES OF liCODES 



MALES* 



1. Legs longer than body. (From bat 



habitats) I. VESPERTILIONIS 



Figures 232 and 233 



Legs not longer than body. (Not 



from bats) 2 



*The males of I. nairobiensis and of I. s. simplex are not known. 



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