REMARKS 



Christophers* (1906) extensive study on morpholo^ and diges- 

 tion of 0. savignyi has been reviewed in the section on 0. moubata , 

 which also contaxns a niimber of other data pertaining to~both 

 species. 



The nymphal instars may be approximately determined according 

 to Cunliffe's (1922) data, also presented by Campana-Roiiget (195A). 



The haller*s organ of 0. savignyi has been described and il- 

 lustrated (Schulze 19A1). ~ 



Jakob (192A) used this tampan to illustrate certain theories 

 separating the ixodids from the argasids on the basis of differences 

 in external grooves, ridges, and prominences. He did not believe, 

 as a result of these studies, that Argas developed from Ornithodoros , 

 but rather that both genera had a common origin in the Uropodidae, 

 a member of which, Discopoma africana Vitzhum, was illustrated. 



DISEASE REIATIONS 



MAN. The bite of 0. savignyi may have severely painful seque- 

 lae but this tampan has~"never been found infected with pathogenic 

 organisms in nature, and transmission of pathogens has not been 

 demonstrated until recently. Even the earlier assertions that the 

 eyed tampsin transmits human relapsing fever (Borrelia spp, ) have 

 been cast into considerable doubt by subsequent research. 



DOMESTIC ANIMALS, Camels and cattle sijffeT greatly and may 

 even be killed by the volttme of blood lost to numbers of eyed 

 tampans in their pens, 



EXPERIMENTAL. Leishmania donovani , which causes kala azar in 

 human beings, does not develop in 0. savignyi . Trypanosoma cruzi 

 undergoes development in this tick"in the laboratoiy. T. evansi 

 cannot be transmitted from the tick to animals except by inocula- 

 tion of a STOs pension of infected ticks. 



Experiments on transmission of heartwater Qlickettsia ruminan - 

 tium) of cattle by means of 0. savignyi have been unsuccessful, 



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