PERIOD DAYS (Minirmw.) 



Total Ul 195 



The prefeeding periods in the above table are arbitrary and 

 in nature nay be shorter than the figures indicate. Ualker fed 

 larvae and nymphs on a rabbit and adults on a ra-i. Lewis (1932A) 

 used hares, chickens, and sheep as hosts. 



Nuttall (1915) recorded attachment periods twice as long as 

 Lewis' and stated that males may remain on the host for from four 

 to eight months, and may even die there. At 30°C . , larvae emerge 

 from eggs after sixteen to 31 days; at 15 C . larvae fail to hatch. 



On the other hand, I'ettam (1933) reported that in his Uganda 

 laboratory "'tim.es occupied during feeding, molting, etc. are 



much shorter than the one obtained by Lev/is", but these 



observations apply only so far as the nymphal stage. 



Larvae feeding on man drop off the host after twelve hours 

 (Joyeux 1915). 



Under laboratory conditions, the longevity of A. variegatum 

 (? unfed adults _ Hh) is 732 days (Lewis 19393). 



In those parts of its range with but one rainy season annually, 

 the tropical bont tick has only a single generation a year, as 

 reported for Ilyasaland by Wilson (19503) and for '.lorthern Rhodesia 



_ 272 _ 



