DRAWINGS IN THE TEXT 



.^ 



FIG. 

 I. 

 2. 

 3. 



4- 

 5. 

 6. 



7- 

 8. 



9- 

 10. 

 II. 

 12. 



13- 

 14. 



16. 



17. 

 18. 



19. 

 20. 

 21. 

 22. 



23- 

 24. 



25- 



26. 

 27. 

 28. 

 29. 

 30. 



31- 

 32. 



Section through Skin and Cuticle of Bluebottle 



Stonefly [Taeniopteryx) and Jaws 



Germ-cells (Sperm and Egg) of Insects 



Stages in Growth of Plant-bug 



Owl Moth {Agrotis) with Egg and Larva 



Mouth-parts of Earwig 



MOUTH-PARTS OF BrEEZE-FLY 



Jaws and Mouth of Shield-bug 



Maxilla of Owl Moth 



Digestive and Nervous Systems of Honey Bee 



Crop and Stomach of Honey Bee 



Blood and Air-tube Systems of Honey Bee 



Malpigkian Tube of Honey Bee 



Tracheal System of Termite 



Spiracle and Air-tubes of Louse 



Histology of Insect Muscle 



Leg of Cockroach with Muscles 



Wing-structure in Stone-fly and Dragon-fly 



Wing-muscles of Honey Bee 



Wings of Bee 



Wing-coupling Apparatus . 

 Mandibles of Cockroach with Muscles 

 Maxilla of Cockroach with Muscles 

 Head of Plant-bug with Muscles 

 Sense-organs in Feeler of Syrphid Fly 

 Chordotonal Organs .... 

 Tympanal Organ of Chrysiridia . 

 Compound Eye of Honey Bee 

 Details of Bee's Eye .... 

 Trails of normal Bees in Directive Light 

 Trails of Bees with one eye obscured . 

 Diagrams of Cell-division and Maturation 



xiii 



PAGE 

 2 



3 



9 



12 



18 



20 



22 



24 

 26 

 28 



33 

 38 

 41 

 43 

 48 



51 

 55 

 56 

 58 

 59 

 62 

 64 

 66,67 

 74 

 79 

 81 



84 

 86 



97 



99 



119 



