WEST AFRICA ; FRE^JCH WEST AFRICA (Rousselot 1951,1953B. 

 Hoogstraal 1955D. Villiers 1955). 



CariRAL AFRICA ; FRENCH E(iUATORIAL AFRICA (Bate, "New 

 Cameroons"j (Nuttall and Warburton 1915. Hoogstraal 1955D). 



EAST AFRICA ; SUDAJJ (As $ of H. calcarata ; Neumann 1910A. 

 As H. houyi ; Hoogstraal 195AS,1953d). 



UGAI>!DA and KEIJYA (Hoogstraal 1955D). 



HOSTS 



Ground-sqmrrels, Euxerus erythropus subspp. (All authors). 

 King's specimen from " Xerus rutilus " at Bor (SGC) is based on a 

 misidentification of the hosTI E. erythropus is the common ground- 

 squirrel of VIest Africa, and of Horthcentral and East Africa west 

 of the Rift Valley. East of the Rift Valley it is replaced liy 

 Xerus rutilus subspp., parasitized by H. calcarata Neumann, 1902*. 

 In Kenya, Xems is confined to hot lowTands and Euxerus to liigher, 

 arable mountains from 2000 feet to 6000 feet elevation, but mostly 

 above 3000 feet. If , as now seems apparent, it is true that these 

 two ticks are so host specific, this vrauld seem to be a bolstering 

 argument against lumping these two squirrel genera in one genus, 

 as some mammalogists advocate (Hoogstraal 1955D). 



BIOLOGY 



Aside from the fact that all stages may be found on a single 

 ground-squirrel, little is known concerning the biology of H. 

 houyi . This tick and its host inhabit savannah country witli few 

 or scattered trees, and upland grasslands. Along the southern 

 border of the squirrel's range it extends into forested districts, 

 but only in tongues of grassland with scattered trees between 

 thicker forest. As already stated under HOSTS, in Kenya, where 

 the two host genera and the two related tick species occur near 

 each other, tne host of H. houyi is confined mostly to arable up- 

 lands and that of H. calcarata inhabits warmer and more arid low- 

 lands. *" 



«The record of H. calcarata from Dahomey (Villiers 1955) undoubtedly 

 is based on misidentification. 



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