- 79 - ARGAS. 



157. Male. Make a drawing of the ventral surface, showing : body ; four pairs of 

 legs, with terminal claws and vestigeal pulvillus on each ; capitulum ; hypostome ; 

 two chelicerse ; two palps ; genital aperture ; anus ; spiracles outside bases of fourth pair 

 of legs ; apertures of coxal glands, between first and second pairs of legs. 



158. Female. Draw a ventral view to show the female genital aperture. 



