287 



Adults have no suckers beneath claws. Slight sexual dimorphism. 

 Anus near middle of venter. Skin rough. 



Genus Argas. Body narrow in front. Margins thin and acute. No eyes. 

 The A. persicus (Miana bug) of Persia has been supposed to be concerned in the 

 transmission of a serious disease. Rostrum some distance from anterior margin. 

 It is also called the fowl tick and transmits fowl spirillosis. 



Genus OrnUhodoros. Margins of body rounded. Skin has many irregular 

 tubercles. Rostrum even with anterior margin so that ends of palpi slightly project. 

 It is the intermediate host of Spirochaeta duttoni. (South African tick fever.) 



O. moubata is very common in Africa living in cracks in mud floors and bites 

 severely the sleeping natives. The larva makes its first moult inside the egg so 

 that it shows 4 pairs of legs when it emerges. Christy thinks it may transmit 

 Filaria perstans. 



O. savignyi has two pairs of eyes near base of mouth parts. 



<f . X^A^ 



EIG. 79. OrnUhodoros moubata. (Murray from Doflein.) 



Subfamily Ixodinse. 'Mouth parts project in front of body when 

 viewed dorsally. Scutum present. Stigmal plates posterior to fourth 

 pair of legs. Adults have suckers beneath claws. Skin finely striated. 



Anus behind middle of venter. 



Sexual dimorphism marked. Male has well-developed scutum; 

 female has porose areas. 



Section Ixodce. Transverse recurved preanal groove in female. Male has ventral 

 surface covered with chitinous plates. No eyes. Genus Ixodes. 



Ixodes has long rostrum with slender palpi palpi narrow at base, leaving gap 

 between them and hypostome. 



Section Rhipicephalus. No preanal, but postanal groove in female. Ventral 



