20 



DISEASES DUE TO PROTOZOA 



It attacks man and beast, feeds slowly; the victim must be asleep 

 for it to receive a good feed which requires two to lliree hours. 



It deposits its eggs in batches of 50, 70, 100; these hatch in about 



Oniithodonis vioitbata. a. Ventral aspect ; />, dorsal aspect ; c, lateral aspect 

 between second and third pair of legs. 



twenty days. The larval stage is practically omitted in this variety. 

 After about thirteen days the eggshell splits, also the larval skin, and 

 an eight-legged nymph throws off both covers simultaneously. 



