there is a long, intense dir,- period but in the shorter rainy- 

 season fifteen to twenty inches of rain falls per anniira thou^rh 

 once in every twenty years there is a rainfall of over 25 inches. 



DISEASE RELATIONS 



Man ; Note the several records of R. pravus attacking ma:i 

 in the S\adan. ~ 



Domestic animals ; There Is a suspicion that the '*R. bursa " 

 which Daubney and Hudson (193/C) considered as a possible vector 

 of Nairobi sheep diseases is actually R. pravus . It nay, however, 

 have been R. kochi or R. hurti. *" 



R. pravus is an efficient laboratory vector of East Coast 

 . par 

 in nature, possibly because its immature stages do not feed on 



fever (Theileria parva ) but is not knovm to act in this capacity 

 in nature, possibly becai 

 larger domestic animals. 



rh-:arks 



For synonjTny of this species, see Theiler and Robinson 

 (1953B, p. 13-^.) and Walker (1956), who have also redescribed 

 the adult stages and described the immature stages. 



Santos Dias (1952E) has described a gynandroraorph of R. 

 pravus (as R . neavi ) . " 



IDENTIFICATION 



Kale ; The combination of a large, triang\ilar, dorsal 

 projection of coxa I and of slightly convex eyes bordered by 

 at least a furrow or usually by a completely encircling groove, 

 readily distinguishes this from other species. In South Africa, 

 the convexity of the eye seems to be more variable and the en- 

 circling fxirrow is confined to the anterior margin of the eye. 

 No Sudanese specimens without convex, mostly fully encircled 

 eyes have been seen. The moderately numerous, fine and medium- 



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