528 



ReJapsing Fever 



the valves are absent. The eggs number 50-100, measure 1.3-1.5 mm. in length 

 and 0.8-1 mm. in breadth. They are oval, smooth and of a dark brown or black 

 color. 



Habitat. — Arabia, Nubia, Egypt, Somaliland, Abyssinia, German East Africa, 

 Cape Colony, Rhodesia, Bechuanaland and Portuguese East Africa. In India it 

 is common in the Madras Presidency, in Gujarat, and in many parts of the Bom- 

 bay Presidency. In Aden it is widely distributed throughout the Hinterland, 

 where its principal host is the camel. 



Ornithodorus moubata.— Patton and Cragg describe this tick as follows: Body 

 almost as broad anteriorly as posteriorly; covered with non-contiguous mamillae' 



Fig. 201. — Ornithodorus'moubata. Tick that transmits African relapsing fever: 

 a, Viewed from above; b, viewed from below (Murray from Doflein). 



Fig. 202. — Ornithodorus savignyi. An, anus; cam, camerostome; cx.I., coxa 

 I; cx.II, coxa ll;cx.III, coxa III; cx.IV, coxa IV; ca;./., coxal fold; e, eye; g.a., 

 genital aperture; g.g., genital groove. 



but with fewer hairs than savignyi. ' Basis capituli broader than long and shorter 

 than the palps; hypostome with six principal rows of teeth. Tarsi of legs I, II 

 and III with three humps as in savignyi; those on the pro-tarsus are subequal, 

 more pointed and about equidistant, while those of savignyi are unequal, less 

 pointed and not equidistant. The tarsus of leg IV in moubata is shorter and 

 thicker than in savignyi, and its humps are nearly equidistant. Eyes absent. 

 Length 8-12 mm.; breadth 6-10 mm. The eggs are ovoid, measure 0.8-0,9 mm. 

 in length, are smooth on the surface and dark yellow in color. 



Habitat. — Africa: from British East Africa to the Transvaal, and across to the 

 Congo; southward to German East Africa and Cape Colony. It is common in 

 Egypt, Abyssinia and in parts of Somaliland and in Portuguese East Africa. 



