524 



Genus HaemapJijiscdis 



Adults. 



itbserver 

 Nuttall 



Xo. 

 1 



Date of 

 emergence 



13. I. 1906 



2 18. IV. 1906 

 Stockman 16/-4 6. ix. 1906 



Date to which Longevity 

 adults survived unfed (days) Remarks 



255 



160 



At 12° C. Lived longer, 

 death not noted. 



IS. IV. 1907 224 At outside temp., feeble 



when state recorded. 



Oviposition. 



The manner in which the female H. cinnabarina var. imnctata lays 

 her eggs was illustrated by me in the Harben Lectures 1908, p. 398, 

 but I kept no records of the time it takes for the tick to oviposit and 

 did not count the number of eggs laid by single females. Judging 

 from memory a female would lay 3000-5000. When the opportunity 

 arises I shall have enumerations made. Apart from this the only other 

 observations recorded are those of Stockman which are likewise incom- 

 plete. He states that the shortest and longest times which elapsed 

 before oviposition commenced were 10 and 211 days respectively, the 

 female usually ovipositing 24-29 days after abandoning the host. Some 

 gorged females (Lot 27) survived 216 days without ovipositing. He 

 gives no temperature records in his protocols; the only records with 

 dates are the following: 



stockman 

 No. 



16/3 



16/4 



Female dropped 

 from host 



12. XI. 1906 

 12. X. 1906 



Eggs first 

 laid on 



20. V. 1907 

 15. II. 1907 



Oviposition 

 commenced after 



189 days 

 124 „ 



Stockman does not state how' long oviposition lasts, but he says that 

 the process may be interrupted with the onset of cold weather and 

 resumed when the weather is warm. 



The following description of the process of oviposition in H. cinna- 

 barina var. punctata is quoted fi-om Nuttall (vii. 1908, p. 398): "In 

 the accompanying figure (Fig. 450) I have illustrated the successive 

 stages I have observed in the process of oviposition in Haemaphi/salis. 

 Prior to oviposition the capitulum is retracted so that it lies in a 

 depression beneath the scutum, the vulva approaching the capitu- 

 lum. When about to oviposit, a remarkable organ (which I named 

 ' Gene's organ,' after its discoverer) is protruded between the scutum 

 and capitulum. The organ appears in the form of two vesicles 

 containing hyaline secretion, the vesicles being protruded and retracted 

 rhythmically whilst being completely extruded. When Gene's organ 



