286 



Life history of Eu. evertsi with two hosts : 



Eggs. Hatch on the ground (a variable 



period) ... ... ... 31 days. 



Larvae. Attack a horse -(first host), take 

 infection, moult, while still 

 on the horse, and then 

 become ... ... ... 3-4 days. 



Nymphs, (a) Remain on horse and also 



take infection in this stage. . . 16 days. 

 (b) Drop on to grass, remain 

 dormant, and then moult 

 and become in ... ... 24 days. 



Adults. (a) On grass 



(b) On horse (second host), 

 give infection, copulate, 

 females suck blood and fall 

 to the ground. 



Piroplasmata occur also in the male ass and zebra, 

 but whether identical with P. equi remains to be seen. 



6. P. canis. The cause of ' malignant jaundice' 

 of dogs. Has been recorded from Europe, Africa and 

 India, but probably has a much wider distribution. 

 The disease takes an acute or chronic course, and may 

 occur in a latent form with few symptoms. 



Acute Form. Is characterised by (i) a high tem- 

 perature except in young dogs where the temperature 

 may be sub-normal ; (2) Marked constitutional 

 disturbance, prostration, anorexia ; (3) As a rule 

 haemoglobinuria ; (4) Less frequently icterus ; 



(5) After a day or two intense anaemia, with a pipe-clay 

 coloured tongue, pallid gums, and white sclerotics ; 



(6) In very acute cases paresis or paralysis of the hind 

 legs. Death in a few days or in the case of very young 

 dogs in twenty-four hours. 



