-6 3 - 



Ventral aspect.— The sternum of the mesothorax is a 

 saddle-like, six-sided piece. Cephalad the bounding suture 

 runs transversely, but caudad the sternum projects by an 

 acute-angled process between the mesothoracic coxae. It 

 chiefly forms the pectus or chest of the insect. It bears a 

 median, impressed, longitudinal line. 



METATHORAX. 



The metathorax is much smaller than the mesothorax ; 

 its dorsum, especially so. 



Dorsal aspect — The dorsum comprises but two sclerites : 

 the scutum and the scutellum. The scutum is divided into 

 two triangular pieces by the triangular, cephalad-projecting 

 scutellum. Neither the praescutum nor the postscutellum is 

 visible. 



Lateral aspect. — The episternum is irregularly trape- 

 zodial, uniting with the sternum by a narrow dorso-ventral 

 neck or bar. Just cephalo-dorsad of its cephalo-dorsal corner, 

 lies the small hemispherical paraptcron. Caudad of the 

 dorsal half of the episternum lies the epimeron, a rather 

 large, irregularly-square sclerite, with a long, caudo-mesad- 

 projecting tongue running from its ventro-caudal corner. 



Ventral aspect. — The metathoracic sternum is not easily 

 bounded. The suture between the episternum and the ster- 

 num is obsolete. The connecting bands running ventro- 

 mesad on either side from the episterna meet and expand on 

 the ventrimeson, forming a subquadrangular space. 



Make a semidiagrammatic drawing showing the dorsal 

 aspect of the thorax. 



Make a semidiagrammatic drawing showing the lateral 

 aspect of the meso- and metathoracic segments, including 

 the coxae of the legs. 



