3 2 9 



between first and second. Skin covered with hemi- 

 spherical warts. Attacks man. Africa and India. 



(2) O. -pavimentosus. -- Eyes present. Body 

 covered with flat warts above forming a pavement. 

 Distance between the knobs .on last segment of hind 

 legs as in O. savignyi. Habits similar to those of 

 O. moubata. S. Africa. 



(3) O. morbillosus. Eyes present. Has only two 

 knobs on hind tarsi. Africa. 



(4) O. moubata (= O. savignyi, var., caeca.) 

 No eyes. Distance between the first and second and 

 second and third knobs on last segment of hind legs 

 about equal. This segment is stouter and more 

 compressed than in the three previous species. Africa. 



Pathogenicity. Transmits Sp. duttoni, probably 

 in nymphal stage mainly. 



Bionomics. In O. moubata the larva does not 

 leave the egg, but moults inside and leaves it as 

 the eight-legged nymph. 



It is a night feeder, leaving its host after it has 

 sucked enough blood, to conceal itself during the day 

 time. Eggs are laid and the ticks moult after each 

 blood meal. Their life extends to a year or so, whereas 

 in the Ixodidae it is only some months. 



(5) O. megnini. The spinose ear tick in America. 

 Attacks animals and man, occurring mainly in the ears. 



(6) O. turicata. Attacks pigs and man. 



GENUS ALECTEROBIUS (Pocock) 



Differs from Ornithodoros in having a fold of skin 

 capable of being folded under the palp. 



(i) A. talaje, the ' chinche ' of S. America and 

 elsewhere, is very troublesome to man. 



