DISEASES CAUSED OR CARRIED BY MITES AND TICKS 417 



lays her eggs which develop into six-legged larvae. They do not infect 

 the dog, which they attack as soon as possible and on which they remain 

 two days sucking blood. After dropping off they in due time shed their 

 larval skin and become eight-legged nymphs which again attack the dog, 

 but do not infect it. The nymph, after dropping off, undergoes meta- 

 morphosis and sheds its nymphal skin, and becomes the sexually mature 

 tick, which is the only form that spreads the infection, according to 

 Lounsbury (1901), and Nuttall. 



Babesia divergens (McFadyean and Stockman), the cause of British 

 RED WATER OF CATTLE, is principally carried by Ixodes ricinus 

 (Linnaeus) Latreille, altliough McFadyean and Stockman succeeded in 

 transmitting the disease by means of Haertiaphy salts cinnabarma 

 punctata Canestrini and Fanzago (Nuttall, Warburton, Cooper, and 

 Robinson, 1915). 



Babesia gibsoni (Patton), cause of BABESIASIS OF THE JACKAL 

 AND DOG, is said by Neumann to be carried by Rhipicephalus simus 

 Koch. Patton found infested jackals with Haemaphysalis birmaniae 

 Supino (bispinosa) and Rhipicephalus simus Koch but did not prove 

 that they were infected. 



Babesia minense Yakimoff, the cause of BABESIASIS OF THE 

 HEDGEHOG, is said by Doflein to be carried by Dermacentor reticula- 

 tus (Fabricius) Koch. 



Babesia ovis (Babes), the cause of CARCEAG of sheep, is heredi- 

 tarily transmitted by Rhipicephalus bursa Canestrini and Fanzago. The 

 daughter adult tick, developed from a tick which sucked the blood, is 

 the stage which transmits the disease. The disease has been trans- 

 mitted by Haemaphysalis cinnabarina punctata Canestrini and Fanzago 

 experimentally. 



Crithidia haemaphysaUdis Patton is hereditary in Haemaphysalis 

 birmaniae Supino (bispinosa) in India. 



Crithidia hyalommae O'Farrel is hereditary in Hyalomma aegyptium 

 (Linnaeus) Koch in the Sudan. 



Nuttallia eqiii (Laveran), the cause of NUTTALLIOSIS OF 

 EQUINES, was demonstrated by Theiler to be transmitted in South 

 Africa by Rhipicephalus cvertsi Neumann. Considerable evidence points 

 towards Hyalomma aegyptium (Valladares 1915). 



Rossiella rossi (Nuttall), the cause of JACKAL ANEMIA, is thought 

 by Nuttall to be possibly carried by Haemaphysalis leachi (Audouin) 

 Neumann. 



Theileria parva (Theiler), the cause of EAST COAST FEVER or 

 RHODESIAN FEVER, has been known by Theiler (1903, 1904, 1908) 

 and Lounsbury (1906) to be transmitted by Rhipicephalus appendicu- 

 latus Neumann, R. simus Koch, R. evertsi Neumann, R. capensis Koch 



