ii CONTENTS. 



PAGE 



THE CORSELET IN INSECTS. 



Divided into three rings . . . 25 



Law of proportion . . ib. 



The breast plate . . . ib. 



The breast prop . . . .26 

 Its uses .... ib. 



The flanks, upper and under . 27 



The wing scale . . . ib. 



The horn scale . , . .28 



Divisions of the back of the corselets . . ib. 



The back plate ' , - , . ib. 



The fore back plate ., *' 1 ''(' l . 29 



The mid back plate ^ . 30 



The back scale .' " . ib. 

 The bridle . ^ ' r KZ> i<r'S- ' 3l 



The hind back plate . ... T/>f: . ib. 



Mechanism to aid the muscles and wings . 32 



Middle line of partition . . .33 



Recapitulation . . . ib. 



THE ABDOMEN IN INSECTS. 



Its composition . . . t ! . 34 



Its rings . . ' t ,<. ; . ib. 



Arches of the back and of the belly v *, . ib. 



Motions of the abdomen . ^ .^ . 35 



Cord and pulley mechanism . j. j ^-, . ib. 



Muscles . . ^ . T .^ . 36 



MEMBERS OF INSECTS. 



Meaning of the term . . 37 



Objection to the term Appendage i* 5 **-*' . ib. 

 MEMBERS OF THE HEAD. 



The Ears. 



Their structure * ' .. . 38 



