303 



exhibit variations in different species. Coxae I may 

 show large and conspicuous teeth, or may be bidentate 

 (Fig. 99). Coxae IV, in Haemapbysalis, carries a spine 

 or tubercle (Fig. 96). Tubercles may be present on 

 all the coxae. The terminal segment (tarsus) may 

 carry one or more ' 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. 



s. 



Fig. 99. (A) Front leg of Eurbipicephalus 



(B) Front leg of Hyalomma 

 T = trochanter ; C.I = 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 



