- 68 - MUSCA. 



133. Egg. Draw some eggs under the low power of the microscope. 



134. Larva. Examine in water under the low power and make a drawing to show 

 shape of body, conical in front, broader behind ; head, with two-jointed antennae ; 

 buccal hooks ; eleven body segments ; anterior spiracles ; creeping pads on segments 2-9 ; 

 posterior spiracles ; and inside the body, alimentary canal, heart, and two tracheal 

 trunks. 



135. Pupa. Make a drawing of the pupal case to show segments and remains of 

 larval spiracles. In some cases the opening through which the adult has emerged can 

 be seen. 



