3 02 



canal (Figs. 96 and 98). It is smaller, and much less 

 conspicuous, than in the Argasinae, and in the gorged 

 female is seen only as a minute pore. 



The Stigmata. The stigmal plates or peritremes 

 (Figs. 96 and 98), into which the tracheal system opens, 

 lie behind Coxae IV in the Ixodinae ; between Coxae 

 III and IV in the Argasinae. Considerable variation 



Fig. 98. (A} Dorsal surface of male tick (Hyalomma) 



R. = rostrum ; e = eye ; s = stigmatic plate 



(B) Ventral surface of male tick (Hyalomma) 



R = rostrum ; C^-C 4 = coxae ; s = stigma 



A = anus ; g = genital opening 



Scutum and anal plates black 



exists in the size and shape of these organs in the 

 different species and genera. They also differ in many 

 cases in the two sexes. 



The Legs. Tie legs consist of six segments, viz., 

 coxa, trochanter, femur, tibia, protarsus and tarsus. 

 The basal segments, i.e., the coxae, are enlarged and 



