to a limited, vindiscovered focus in poorly- explored mountains near 

 Yei. 



R. longicoxatus appears to be so patently a rare Somali low- 

 land tick that the single specimen from Bahr EL Ghazal and others 

 reported from French West Africa are difficult to reconcile with 

 previous information, and their significance cannot be evaluated 

 properly iintil further specimens and data become available. 



Montane Components 



The Imatong Area mountain masses (page 85?) harbor outliers 

 of the flora and fauna of both the West and of the East and South 

 African Subregions that occur almost nowhere else in the Sudan. 

 H. par mat a , R. beguaerti , and R. kochi are typical West African 

 Subregion forms found in the Imatong and Didinga Mountains. The 

 few specimens of H. par mat a from the plains level around Torit 

 are asstuned to have been acquired by their hosts in the vicinity 

 of the single stream reaching this area from the mountains. 



The bat parasite I. s. simplex has already been discussed 

 under Palaearctic species"* (page 8^8). Two other species, I. 

 schil lingsi and I. alluaudi, occur on monkeys and on shrews, 

 respectively, in'the Imatong forests and reach here from eastern 

 and southern Africa. 



R. compositus , a species of eastern Africa that also extends 

 into limited areas of western and southern Africa, is generally 

 associated with highland or montane areas but attacks a wide 

 variety of game animals not necessarily confined to these zones. 

 The several specimens from the Sudan have been found near moun- 

 tains but not actually in them. This species is tentatively 

 categorized as montane on the basis of its known distribution 

 elsewhere. 



West African Components 



West African savannah species in the Sudan fauna are B. 

 annulatus *, D. c. circumfiuttatus , R. cuspid atus , R. longus and 



»B annulatus is an introduced American species that in the 

 Ethiopian Paunal Region is known chiefly from the West African 

 Subregion. 



- 850 _ 



