24 



arated halves of the sternellum of the mesothorax or meso^ 

 sternellutn. 



Caudad of the mesosternum and mesosternellum there is a 

 large sclerite, the mesal part of which is prolonged cephalad so 

 as to accurately fit the notch in the caudal border of the meso- 

 thorax ; this is the sternum of the metathorax or metasternum. 



The two halves of the sternellum of the metathorax, or 

 metasternellum^ are widely separated, each being situated near 

 the base of the corresponding leg. 



The caudal border of the metathorax is also notched, and 

 the first abdominal segment is dove-tailed into it. 



Cephalad of the base of each mesothoracic and meta- 

 thoracic leg there is a crescent-shaped sclerite ; this is the 

 antecoxal piece. 



Make a drawing of these parts. 



Lateral parts (episterna, epimera, and peritremes). 

 — Examine one side of the second and third thoracic seg- 

 ments. Note that it is chiefly composed of four large scle- 

 rites, which extend from the fossse of the legs dorsocephalad. 

 These sclerites are named as follows : — 



Episternu7n of the fnesothorax. — The first or cephalic of 

 these four sclerites is the epistet'imm of the mesothoj-ax. The 

 sutures between the episterna and the mesosternum are only 

 faintly indicated in this species. 



Epimeron of the mesothorax, — This is the second of this 

 series of sclerites. 



Episternum of the metathorax. — This is the third of this 

 series of sclerites ; it is the one which bears the oblique 

 yellow band characteristic of this species. 



Epimeron of the metathorax. — This is the caudal member 

 of this series of sclerites. 



Spiracles and peritremes. — Between the ventro-caudal angle 

 of the epimeron of the mesothorax and the fossa of the leg 

 is an organ which consists of a slit-like opening guarded by 



