510 Directions Jhr placing the Plates of the Twentieth Volume. 



Tab. 19. Athalamia pinguis and Lemanea fluviatilis to face page 402 



20. StructuTe of Melianthea 418 



21. Anatomy of Pteronarcys, Sic 452 



22. Species of Athyreus . 476 



• 2.3. ] 



> Structure of Triplosporite 484 



END OF THE TWENTIETH VOLUME. 



HuA cka^if -^ 



PRINTED BV RICHARD TAYLOR, RED LION COURT, FLEET STREET. 



