exhibit variations in different species. Coxae I may 
show large and conspicuous teeth, or may be bidentate 
(Fig. 99). Coxae IV, in Haemaphysalis , carries a spine 
or tubercle (Fig. 96). Tubercles may be present on 
all the coxae. The terminal segment (tarsus) may 
carry one or more c spurs,’ which are of use in 
identification of species. The tarsus also carries two 
large curved claws, and a pulvillus (membranous 
sucker) in the Ixodinae but not in the Argasinae. 
Fig. 99. (. A ) Front leg of Eurhipicephalus 
(B) Front leg of Hyalomma 
F = trochanter; C. 1 = coxa; S — spine 
To Distinguish the Sexes in the Ixodinae 
(•1) The scutum in the male covers practically 
the whole dorsum whilst in the female it covers only 
the anterior third (Figs. 96 and 97) ; as a result the 
male has often a more uniformly shiny look. The male 
also is sometimes smaller and more elongate in outline 
than the female. 
(2) The males of certain species possess structures 
not seen in the female, notably the anal plates and, in 
some cases, a rudimentary tail (Fig. 96). Marginal 
