24 



arated halves of the sternellum of the mesothorax or meso' 

 sterncUum. 



Caudad of the mesosternum and mesosternellum there is a 

 large sclerite, the mesa! 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^dire 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 fossae of the legs dorsocephalad. 

 These sclerites are named as follows : — 



Episternum of the mesothorax. — The first or cephalic of 

 these four sclerites is the episternum of the mesothorax. 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 



