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II. Species in which only females are found on the hosts,
and in which males may or may not be known.
Although the males of species confined to the Ethiopian Famal Region (except Ixodes nairobiensis Nuttall, 1916 and I. hoogstraali Arthur, 1955) are known, their habits are still obscure.
The genus Ixodes has been reviewed by Nuttall and Warburton (1911), to which important additions have been made by Nuttall (19130,1916). The African representatives of this genus are re viewed by Arthur (ms.), who also proposes a number of new species.
Careful examination of rodents and other small animals, and of dogs and other domestic animals will probably reveal other spe cies in the Sudan, especially on the west bank of Equatoria Prov. ince. Search in rodent nests, animal lairs, and bat caves and retreats should prove fruitful.
No African Ixodes has been reported to transmit human diseases, but at least Ixodes cavi palpus and I. rasus are known to bite man. In southern Airica, I. rubicundus is an important cause of tick paralysis of sheep. I. pilosus, to which this condition is most commonly attributed in literature, plays no known rôle in this affliction; early misidentification was the cause of this fre quently quoted misstatement (Theiler, correspondence).
*The males of I. nairobiensis and of I. s. simplex are not known.
Figures 212 and 213, 0, dorsal and ventral views Figures 214 and 215, 2, dorsal and ventral views
SPECIAL MORPHOLOGICAL FEATURES, IXODES TICKS