Fig, 8.— a, Jaws and mouth of Shield-bug (Tessaratoma) shown as 

 dissected from the side with the labium (la) displaced backwards. X 22. 

 B, Cross-section through piercing stylets of a shield-bug (Graphosonia). 

 X 300. Mn, mandible ; Ma, maxilla ; c, clypeus ; Ir, labrum ; 

 ph, phary^nx ; g, gullet ; p, salivary pump with muscle ; d, salivary duct ; 

 scj suction canal, and ec, excretory canal between maxillae. After C. 

 Bugnion, Arch. Zool. Exp. (5) vii, 191 1. 



