I 



.)oi: Genus Haenidplnisalis 



Hailweu found tliat the larvae emerged 47 days after the eggs were 

 h\i(l in May 1910; in 45 days after the eggs were laid in July 1911. 

 Hunter and Hooker (1907) state that metamorphosis lasted 24-31 days 

 in May-Septenihcr. 



Larva to Nymph: reckoned from the time the larvae drop off 

 gorged from the host, Rohr found that the nymphs emerged after 



15-2"2 dajs at ca. 20-21^ C. (5 obiservations) 

 8-12 ,, „ 2(5-27° C. (5 ., ) 



7-9 ,, ,, 30° C. (3 „ ) 



the ticks died without moulting at 35° C. 



Hooker, Bishopp and Wood record that the nymphs emerged after 



18 days at ca. 20° C. (in March) 

 134 „ ,. 16-5° C. (in November) 



Hooker gives 18 days as the time required for metamorphosis in 

 October. 



Nymph to Adult: reckoned from the time the gorged nymphs 

 abandon the host, Rohr found that the adults emerge after 



19-26 days at ca. 20-22° C. 

 10-17 ,, ,, 27°C. 



Plooker, Bishopp and Wood record that the adults emerge after 



11 days at ca. 28° C. (June 1908) 

 89 „ „ 15° C. ( „ ) 



124 ,, was the longest period observed 



These authors noted no difference between the </ and $ in respect 

 to the time required for metamorphosis. Hadwen records that from 12 

 gorged nymphs there emerged 2 adults after 53 days, and 1 adult after 

 58 days, in July-September, 1911. 



Longevity of unfed ticks. 



Larvae: Hooker, Bishopp and Wood found that larvae which 

 emerged early in the summer, died in about 60 days; others which 

 emerged in June, 1906, survived up to 258 days. 



Nymphs: these survived, in three experiments, for 78, 246 and 

 307 days respectively, the ticks being kept in the laboratoiy. Specimens 

 taken from a rabbit survived for 342 days. 



Adults: a (/" lived for 40;;} days, a $ for 588 day.s, b»jth having 

 emerged in May. 



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