Proc. S.L.E. d- N.H. Sor. 



Plate VII, 





A. Mouth-parts of imago of CordulegaUer annulatus, Latr. ( x 4-8). 



B. First maxilla of C. annulatus ( x 7"2). 



C. First maxilla of a grasshopper. 



D. Mask of an Aeschnid dragonfly, shewing hinges. 



E. Labium (second maxillae) of a Blattid. 



F. Hypothetical arrangement of parts of labium of dragonfly naiad before 



fusion took place. The shaded part became mentum with ligula. 



c, cardo ; g, galea; h^, h.^, h.^, Ii^, hinges ; I, lacinia + galea ; la, lacinia ; 

 ifii, labium ; ihr, labrum ; ))(, mentum ; )iih, moveable hook; nin, mandible; 

 mx, maxilla; p, palpus; s, submentum ; st, stipes. 



(All the figures are diagrammatic, and unnecessary details, such as hairs, 

 are omitted.) 



