Taveta District, northwest section of Narok District in the Masai 

 Reserve, southern part of Ukamba Reserve, Kapenguria area of 

 Tiorkana Province, and between the Athi and Tiva Rivers; also 

 several areas of Uganda and Tanganyika). However, only R. 

 pravus occurs in drier areas, i.e.: Loita Plains in the^Masai 

 Reserve where the game of the open plains, savannah, and forest 

 are favorite hosts and cattle and sheep are also infested. 

 Native stock and wild game in the dry scrub country between 

 the Tiva River and Somalia are heavily infested. R. pravus 

 is also extensively distributed in certain desert areas of 

 Northern Province and extends into Karamoja District of Uganda 

 and into Tanganyika. 



Since the above remarks were written, Wilson's (1953) 

 interesting and important contribution, concerning the R. pravus 

 (= R. neavi ) _ A. geama association in the drier parts of East 

 Africa and the !^. appendiculatus - A. variegatum association 

 in the more humid areas of East and"*Central Africa, became 

 available. The latter association is discussed herein under 

 A. yariegattun (page 27/h) . R. pravus and A. gemma are invar- 

 Tably associated where rairi?ailvery rareTy exceeds 20 to 25 

 inches per annum. /~A. gemma is not known from the Sudan; 

 the Stidan distribution of R. pravus is discussed above_7« 

 These two species range from the dry Karamoja District of north- 

 ern Uganda and the arid Northern Frontier of Kenya in the dry 

 belt of coTontry between a line drawn east of Mt. Kenya and the 

 Machakos highlands and west of the hvunid coastal belt of Kenya. 



A. lepidum is also common in this area and R. e. evert si , 

 H. truncatum , and H. rufipes occur in smaller numbers in Kara- 

 moja. In Northern^Frontier, Rhipicephalus pulchellus is also 

 present in small ntombers but it becomes very common in the diy 

 eastern belt of Kenya, where smaller numbers of a great variety 

 of ticks were found in association with the two species under 

 discussion (R. simus simus, R. muhlensi , R. humeralis , etc.). 



Karamoja soils (like those of much of the southern Sudan) 

 are dark grey or dark brown calcareoiis clays (previoxisly freu. 

 quently called "black?* or "cracking cotton soil") which become 

 exceedingly sticky when wet and form large, deep cracks when 

 dry. Vegetation is either open marshy grassland or grassland 

 associated with Acacia and CombretTjm woodlands. In this area 



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