Volume IV 
OCTOBER, 1911 
No. 3 
NOTES ON TICKS. L 
(1) IXODES CALEDONICUS, DESCRIPTION OF MALE, TOGETHER 
WITH CONSIDERATIONS REGARDING THE STRUCTURE OF THE 
FOOT IN MALE IXODES. 
(2) TYPES OF PARASITISM IN TICKS, ILLUSTRATED BY A DIA¬ 
GRAM, TOGETHER WITH SOME REMARKS UPON LONGEVITY 
IN TICKS. 
(3) REGARDING THE LOSS OF LIFE IN TICKS OCCURRING ON 
WANDERING HOSTS. 
By GEORGE H. F. NUTTALL, F.R.S. 
{From the Quick Laboratory, University of Cambridge.) 
(2 Figures.) 
I. Ixodes caledonicus etc. 
In a paper published last yearb I described the female, nymph and 
larva of Ixodes caledonicus. Having regard to the views expressed in 
my recent paper on the adaptation of ticks to the habits of their hostsb 
I wrote to Mr William Evans, in Edinburgh, asking him, if possible, to 
kindly search the dove-cot at Dunipace, Stirlingshire, for the missing 
male which he would probably find in the habitat of the host, the 
domestic pigeon. On 25 May, 1911, Mr Evans discovered two ticks, 
a male and female in copula, in the dove-cot, and he sent the specimens 
to me for identification. The female accords with my published de¬ 
scription of caledonicus. The male is here described for the first time, 
^ Parasitology, iii. 408-411, Figs. 1-3; reprinted in Ticks, Part II, 198-200, Figs. 
191-193. 
- Parasitology, iv. 46-67, Figs. 1-26; reprinted in Ticks, Part II, 324-345, Figs. 
289-307. 
Parasitology iv 
12 
