3 oo 



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 Hotmaphysalis, 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 

 Aponatnma, Hyalomma, and Amblyomma, 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, 



