3 00 
Haemaphysalis the second and third segments are much 
enlarged, and show considerable elaboration of struc¬ 
ture. In Haemaphysalis the second segment carries a 
sharp conical process characteristic of the genus (Fig. 
9 6 )- 
The Scutum. —The scutum is a dense chitinous 
plate, covering in the male the whole , and in the female, 
a portion of the dorsum (Figs. 96 and 97). Its shape 
varies in different species ; in front it may be emargin- 
ate or non-emarginate ; it may be furrowed or 
ornamented with punctures or coloured spots, and 
perforations (eyes) may be present or absent. 
On the dorsum of the female, behind the scutum, 
there are present, sometimes, two plates resembling 
the porose areas on the rostrum (dorso-submedian 
porose plates) (Fig. 97). 
Eyes. —Are present in Eurhipicephalus , Derma- 
centor and Hyalomma , absent in Haemaphysalis , Eschato- 
cephalus and Euixodes. 
The Anal Opening. —The anus is conspicuous 
(Figs. 96, 97, 98). It is situated about one-third of 
the body length from the posterior margin. The 
actual opening is slit-like, guarded by two lateral semi¬ 
circular plates of chitin. It is surrounded by various 
structures utilised in the identification of species, viz., 
the anal groove, anal plates, and ventral plates. 
The Anal Groove. —May be either anterior to, 
or posterior to, the anus (Fig. 97). In Euixodes the 
groove lies anteriorly, and opens posteriorly. In 
Aponomma , Hyalomma , and Amhlyomma , the position 
is reversed. 
The Anal Plates or Clypei. —These are present in 
the males of certain species (Figs. 96 and 98). They 
are conspicuous plates of chitin, lying on the ventral 
surface upon either side of the anus. Four plates, 
