ticks axe able to withstand long periods of starvation and are 

 very resistant to aridity. The two species discussed in the 

 following pages have been widely spread along man's trade routes. 



Subgenera of Ornithodoros are scarcely better established 

 than those of Argas . 0, moubata and 0. savignyi are closely re- 

 lated species with only one other kiiiSred kind, 0, eremicus Cooley 

 arxi Kohls, 19iU.» of Utah, western North America," Some workers 

 would include only these three species in the genus Ornithodoros 

 and all others in several different genera. This position seems 

 an vinnatural approach and a useless complexity. For present pur- 

 poses, 0, moubata and 0, savignyi are treated as in the subgenus 

 Ornithodoros , the only one presently known to be represented in 

 the Sudan, 



In addition to these two tampans, it is certain that several 

 other species of Ornithodoros occur in the Siodan and await dis- 

 covery. Among these should be 0, foleyi , 0, delano'&i subsp,, and 

 possibly some member of* the 0. tholozani group. When more inten- 

 sive search is undertaken in^the Sudaji it will probably be foiand 

 that 0, erraticus is localized but widely distributed here. 0. 

 erratTcus is broadly characterized by small size (maxiraura length 

 7.5 mm.* usual length 3.0 to 5.0 ram,), oval shape, closely crowded, 

 hemispherical grajiulations interspersed by large discs, and absence 

 of tarsal armature and of cheeks surrounding the mouthparts. Spec- 

 imens will probably be found in small mammal burrows. 



The following are the other known Ornithodoros species that 

 occur in Africa, with selected references concerning them; 



0, arenicolous Hoogstraal, 1953(C); description of all stages; 

 ~ biology; from rodent, hedgehog, and V aranus lizard burrows 



in Egyptian deserts. Absence of spirochetes (Davis ajid 



Hoogstraal 195^). 



0, capensis Neumann, 1901; described from penguin-inhabited islands 

 ~ off Cape Province, Found on Cargados Carajos Island in Indian 

 Ocean (Neumann 1907E), Challenger Expedition specimens from 

 St, Paul's Rocks (Nuttall et al 1908), Present on islands off 

 Southwest Africa (TromsdorT? T^H), Biology of hosts and 

 description of habitat, St, Croix Island off Cape Province 

 (Hewitt 1920). Other South African records (Bedford 193A). 



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