394 
Biology of Ticks 
the recording of the ticks’ wanderings from one seat of attachment to another. 
A record was mapped upon a daily chart, the signs d.and $, pointing in 
different directions and variously coloured, denoting the exact position of 
individual ticks on successive days. The distances traversed by the ticks in 
their wanderings were mostly recorded approximately. 
I. AMBLYOMMA HEBRAEUM. 
The general biology of this species has already been described by me 
(1915, Parasitology, vi. pp. 409-419), it being stated (Ibid. p. 414) that 
Lounsbury is the only author who refers to the behaviour of the sexes upon 
the host. The observations here recorded amplify those of Lounsbury, which 
are but cursorily treated by this author. 
The adults (Lot N. 1732) used in the following experiments belonged to 
the same strain that was employed in my earlier studies ( loc . cit.). They had 
emerged on 9. xii. 1913. There were 167 SS and 95 $$ alive on 25. i. 1915, 
i.e. after having been kept unfed at room temperature for 412 days. A number 
of these ticks were placed successively on a ram’s scrotum as follows: 
Day recorded 
in protocol $ 
On 25. i. 1915 1 12 — 
4 — 13 
10—5 
12—2 
16 2 — 
23—4 
39—6 
Totals 14 30 
Of these ticks, one $ (No. 12) was lost after three days and two (Nos. 29, 
30) disappeared. The following record relates therefore to 13 <$<$ and 28 
and their behaviour upon the host on successive days: 
Records relating to A. hebraeum Males Nos. 1-14. 
d 1. Days 1-10 fixed*; on 11th joined by $ 8 which droppedf on 20th, the d continuing fixed; 
on 36th he rotates 45°; on 37tb he appears excited; on 39th he shifts ca. 2 mm. from his 
original seat of attachment (a distinct crater); he is excited on 42nd, 47th; removed on 132nd 
day. 
d 2. Days 1-10 fixed; on 11th joined by $ 12 which dropped on 20th; he is approached on 20th 
by 9 18; on 21st he is joined by $ 18 which dropped on 29th; he is excited on days 29, 30, 
33, 36, 37; $ 23 is put to him on 39th and stays with him till she dropped on 50th; he is 
excited on days 50, 54, 57; remains fixed to 141st day. 
* The term “fixed” denotes that the tick remained attached immovably at one spot, 
f Meaning dropped off the host in an engorged condition. 
