LIST OF ILLUSTRATIONS. 



FIG. PAGE 



1. Skull of a grasshopper . 4 



2. Portion of compound eye of a fly 8 



3. Median ocellus of a honey bee ....•..:.. 9 



4. Antenna of a carrion beetle . : .12 



5. Tactile hair 14 



6. Nerve endings in tip of labial palpus of a fish moth . 16 



7. Ear of a grasshopper 17 



8. Locust from lateral aspect, auditory organ . . 18 



9. Auditory hairs of a mosquito . . 18 



10. Antenna of a mosquito 19 



1 1 . Tracheal system of an insect 21 



12. Tracheal gill of a Mayfly .22 



13. Digestive system of a beetle . . . . 25 



14. Stages in development of nervous system of a 

 dipter water beetle 29 



15. Concentration in nervous system of a dipter . . 30 



16. Hypermetamorphosis of Epicauta cinerea . . . 34 



17. Larva of tomato worm .... . . 35 



18. Pupa of tomato worm 36 



19. Adult of tomato worm ... ■ ■ 37 



20. Development of squash bug 41 



2 1 . Diagram of insect net 49 



22. Dip net ... 50 



23. Drying board . . . 55 



24. Great water scavenger 61 



25. Egg case of water scavenger .... . . 61 



26. Larva of water scavenger 62 



27. A flower beetle, Euphoria inda 62 



28. Some California ladybird beetles . . ... 70 



29. The searcher . . 71 



ix 



