angolensis , and the dusky-faced warbler, Tricholais acotops . It 

 is difficxilt to determine whether so many kinds of exceptional 

 hosts are the resiilt of wider and more extensive field search 

 or of ecological differences (see BIOLOGY below). 



Laboratory hosts ; Lewis (193 2A) observed that although 

 nymphs and adults fed readily on hares, larvae were more reltictant 

 to do so. From this Lexn.s concluded that hares are less preferred 

 hosts of larvae than they are of other stages, an inference that 

 probably shoxild be modified by other biological considerations. 

 At Onderstepoort, both larvae and nymphs feed readily on guinea- 

 pigs (Theiler, correspondence). 



Questionable remarks and conclvisions ; Lewis (1932A), after 

 examining Roberts' specimens from rodent burrows, concluded that 

 larvae feed less readily on rodents thaji do nymphs. Supporting 

 data were not provided but, unless we are still unaware of some 

 xinique phase in the life cycle of this tick, it appears that in 

 East Africa, at least, larvae and nymphs attack the same host. 

 Data from collections made throughout the entire year will be 

 necessary before other conclvisions can be drawn, 



Lewis (1932A) noted a number of larger mammals, from the 

 size of porcv^)ines to rhinoceros, as nymphal hosts, and Stella 

 (1939B) indicated gviineafowl, Reidentification of pertinent 

 material is indicated. The Onderstepoort collection (Theiler, 

 correspondence) contains a single collection of nymphs from a 

 red hartebeest in Natsil, 



Lounsbury (190AA) "wholly failed in attempts to rear larvae 

 on dogs, not one of many thousands applied having fed to reple^ 

 tion", but later (1906C) succeeded in doing so. The ox was 

 considered an unsuitable host for larvae but "nymphs and adults 

 do not appear to dislike cattle", 



Ajround Lourenco Marques, Sant'Anna (1911 ) noted, larvae of 

 R, s. simus are encountered and so is a human disease, possibly 

 thaT now called boutonneuse fever, following tick bites, Subu 

 sequent reviewers have elaborated this remark to indicate that 

 larval simus bite man, and the more enthvisiastic have quoted 

 this report as stating that the larvae transmit boutonneuse 

 fever. 



- 7U- 



