XI 
CONTENTS. 
CHAP. 
XVII. DIGESTIVE APPARATUS 
XVIII. GLAND STRUCTURE 
XIX. DRONE ORGANS . 
XX. QUEEN ORGANS . 
XXI. PARTHENOGENESIS 
XXII. METAMORPHOSIS . . . , 
XXIII. HERMAPHRODITE BEES 
XXIV. WAX AND COMB CONSTRUCTION . 
PAGE 
. I06 
• II3 
. 126 
• 134 
• 143 
• 153 
. 165 
. 168 
