* - ARGAS. 



159. Egg. Draw an egg under the low power of tho microscope. 



160. Larva. Examine and draw the prepared, slide, showing : body ; three pairs of 

 legs, each with a well-developed pulvillus and pair of claws ; capitulum ; hypostome ; 

 chelicerse ; palps ; anus. 



161. Nymph. Draw a ventral view to show the four pairs of legs, pair of spiracles 

 and absence of genital aperture. 



M 



