arctic in origin though possibly Oriental, is seldom established 

 in tropical Africaj the single population of this species known 

 from the Sudan may already have died out (page 75). 



In summary, H. dromedarii , H. excavatum , H. impeltatum , and 

 0. savignyi might^be considered as normal inhaBitants of the semi- 

 He seFEsor" short grass savannahs of the Sudan, although extensive^ 

 ly distributed by domestic animals. The presence of H. detritum 

 ajid H. marginatum in the Sudan is inexplicable on the basis of 

 our present information. The two bat parasites, I. s. simplex 

 and I. vespertilionis are not vmexpected due to tTieir hosts' 

 fligTit range. A. persicus and A. reflexus are here as a result 

 of human 'activities. ~ 



Ethiopian Species 



Fifty-three of the Sudan's 6^ tick species appear to have 

 originated in the Ethiopian Faunal Region and few exist else- 

 where except for the now cosmopolitan R. s. sanguineus , A. 

 brvimpti that reaches a comparatively few miles Into Egypt, 

 and A. variegatuin that has become established adventitiously 

 in tlEe West Indies. 



The Ethiopian tick fauna of the Sudan is largely East and 

 South African in origin. It appears best to dispose briefly of 

 the vmcertain elements and of the small and relatively unimpor- 

 tant West African and montane components of the fauna before 

 considering the bulk of the species. 



Uncertain Components 



Several species in the present collection are represented 

 by so few specimens and data that inferences as to manner of 

 occurrence in the Sudan or in certain local areas should be 

 postponed pending further facts. A. reflexus , H. detritum , and 

 H. marginatum have been discussed under Palaearctic species 

 "Xpage 8^8;. 



The single specimen of A. pompo sum appears to be far from 

 its favored montane habitat "and movements of cattle between 

 nontane areas known to be infested and Yei are not believed 

 recently to have occurred. This specimen may, however, point 



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