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[Illustration: _Painted by J. J. Masquerier._

  _Engraved by W. T. Fry._

_William Spence, Esq^r., F.L.S._]

            _Published by Longman & C^o. London, July 1825._




                                   AN
                              INTRODUCTION
                                   TO
                              ENTOMOLOGY:

                                   OR
                                ELEMENTS
                                 OF THE
                     _NATURAL HISTORY OF INSECTS_:

                              WITH PLATES.

                  BY WILLIAM KIRBY, M.A. F.R. AND L.S.
                           RECTOR OF BARHAM,
                                  AND
                      WILLIAM SPENCE, ESQ. F.L.S.

                            IN FOUR VOLUMES.
                                VOL. IV.

                            _FIFTH EDITION._

                                LONDON:
                              PRINTED FOR
                 LONGMAN, REES, ORME, BROWN, AND GREEN,
                            PATERNOSTER ROW.

                                 1828.




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




                          CONTENTS OF VOL. IV.

   Letter.                                               Page.

   XXXVII. Internal Anatomy and Physiology of
             Insects. _Sensation_                         1-33

  XXXVIII. Internal Anatomy and Physiology of
             Insects continued. _Respiration_            34-80

    XXXIX. Internal Anatomy and Physiology of
             Insects continued. _Circulation_           81-101

       XL. Internal Anatomy and Physiology of
             Insects continued. _Digestion_            102-126

