20 Ornithodorus savignyi 
Females and progeny maintained at 37° C. 
Two separate series of females were maintained at this temperature, the 
first set being started in November 1912, and the second in July 1913. Out 
of a total of 11 females only four oviposited, the records being as follows: 
9 1, 92 eggs after 19-28 days (from date of emergence) followed by 14 eggs 
after 69 days; 9 2, 100 eggs after 16-17 days; 9 3, 8 eggs after 46 days followed 
by 56 eggs after 78-86 days; 9 4, 71 eggs after 69-74 days. These females were 
fed for another six months without further oviposition taking place and they 
were then discarded. Larvae emerged from 65 per cent, of the eggs, but 
reference to Synopsis II, in which their subsequent history is summarised, 
will show that none of them succeeded in passing the third nymphal stage at 
this temperature. 
Oviposition. 
When first deposited the egg is yellow in colour; it rapidly turns brown, 
more slowly becomes pitchy-brown and finally, in the course of three or four 
days, becomes jet-black. The agglutinative coating soon loses its efficacy in 
this species. The data, relating to oviposition, are summarised in the following 
table, minimum, maximum and mean results being shown: 
Ticks maintained at 30° C. 
,- A -> 
Minimum Maximum Mean 
No. of days before oviposition occurred after $ was allowed 15 20 17 
access to 9 (aberrant case 47) 
No. of eggs deposited after each feed (when oviposition occurred) 4 1 74 62 
No. of days between dates of feeding and oviposition commenc- 5 35 18 
ing or recommencing 
No. of days over which oviposition extended after each feed 1 50 9 
No. of eggs deposited bya9 100 417 219 
Percentage of fertile eggs 62 % 
The mean results are very closely comparable with those obtained in the 
case of O. moubata (at 30° C.), except that the number of eggs oviposited by 
the female is less by 40 per cent. 
No evidence of parthenogenesis. 
Parthenogenetic reproduction did not occur during the course of these 
experiments. Virgin females, which emerged in October 1913, were fed re¬ 
peatedly, and maintained at 30° C. between meals, but they failed to oviposit 
during the following eight months. On the other hand, it has been shown that 
gorged females oviposit regularly about 17 days after the males are allowed 
access to them (at 30° C.). 
Longevity of the female tick. 
When performing their normal functions and maintained at 30° C., seven 
females lived for minimum, maximum and mean periods of 292, 420 and 358 
days respectively. Under similar conditions at 22° C., the female had an average 
life of 775 days (three individuals). 
