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 
0 . moubata. S. Africa. 
(3) O. morbillosus. —Eyes present. Has only two 
knobs 6n hind tarsi. Africa. 
(4) O. moubata (=0. 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) 0 . 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. . 
(1) A. talaje , the £ chinche 5 of S. America and 
elsewhere, is very troublesome to man. 
