G. H. F . Nuttall 
400 
the four species A)nblyomma variegatuni, Haemaphysalis cinnabarma, 
H. cominna and H. inermis, whilst only short notes are given which 
bear on the two species Amblyovima splendidum and Hyalomma syriacmii. 
The notes on Hyalomma aegyplvim, Ixodes putus and Bhijnccphahis 
appendictdatus supplement those already published in Part I. 
I am much indebted to Dr E. Brumpt of Paris for the opportunity 
of studying his notes relating to Haemaphysalis concinna and H. inermis, 
species of whose life-histories nothing has hitherto been known and 
which Dr Brumpt has been the first to raise successfully. The life- 
history of H. inermis is unique among the Ixodoidea. 
When dealing with large numbers of immature stages no attempt 
was made to determine more than the minimum period occupied in 
metamorphosis in each lot, it being recognized that certain individuals 
may undergo development more slowly than do others. The length of 
time the various stages feed upon the host is subject to individual 
variation under what appear to be identical conditions, moreover, 
a marked influence upon the period of parasitism is exerted by the 
blood supply which the tick is able to secure from the host at the point 
of attachment; a poor blood supply lengthens the period of parasitism 
materially. It must be remembered that ticks do not always feed 
immediately after they are placed upon the host and that this delayed 
feeding may easily lead to misconceptions regarding the length of the 
feeding period, consequently minimum periods are more accurate ones 
upon which to base conclusions. 
I have sought, throughout this paper, to give full credit to the work 
of other authors who have studied the biology of some of the species 
to which these notes relate. With a few notable exceptions the data 
supplied in the literature on ticks are exceedingly meagre, and it appears 
desirable to have more precise and detailed information supplied in the 
future by those who are in a position to pursue these studies. 
AMBLYOMMA HEBRAEUM. 
The ticks used for the raising experiments about to be described 
were nearly all descended from two fully gorged and fecundated females 
(N. 1732) received in Cambridge on 20. vii. 1912, from Mr C. P. Louns- 
bury, Chief of the Division of Entomolog^q Department of Agriculture, 
Pretoria, South Africa. A few earlier observations relate to ticks (N. x) 
received in 1905 from the same source in connection with investigations 
on the disease known as Heartwater. 
