Genus Argas 7 



Palps, the pedipalpi, 4-jointed, leg-like appendages on either side of the 

 hypostome. 



(For details of the capitulum consult Fig. 2.) 

 Legs, six articles, coxa, trochanter, femur, tibia, prolarsus and tarsus are always 

 recognisable, and there may be additional " false articulations." Articles 

 1 and 6 are generally referred to as the coxa and the tarsus respectively, the 

 others being indicated by their numbers. Certain dorsal prominences often 

 present on articles 5 and 6 are referred to as humps or dorsal protuberances. 



.--V 



preanal groove 



transversa 

 postanal groove 



Supracoxal fold 



genital orifice 



eye 



coxal Fold 



spiracle 



median 

 ^'-postanal 

 groove 



Fig. 1. Ventral aspect of Ornithodoros coriaceus s with names of parts 

 referred to in the descriptions (Nuttall, 1908, Fig. 2). 



Palp article* 

 Art.? 



S -External j of Chelicera 



hypostome 

 -Shaft of 



Fig. 2. Capitulum of Argas persicus s with names of parts referred to 

 in the descriptions (Nuttall, 1908, Fig. 4). 



