Vlll ILLUSTRATIONS. 



ILLUSTRATIONS. 



PLATES IN PART I. PAGE, 



I. Second crop of alfalfa on land disked the previous March. . .Frontispiece. 

 II. Melanoplus differentialis, female ovipositing, with section of ground 



exposing egg-pods, in situ 22 



III. Egg-pods of Melanoplus differentialis 24 



IV. Various stages of last molt of Melanoplus differentialis 26 



V. First crop of alfalfa on land disked the previous March 50 



VI. First crop of alfalfa on land disked the previous March ( in windrow 



and swath ) 54 



VII. Hopper-dozer at work in alfalfa 56 



VIII. Hopper-dozer at work in Kafir corn : 58 



FIGURES IN PART I. 



1. Melanoplus differentialis, female 19 



2. Melanoplus differentialis, male 19 



3. Eggs of Melanoplus differentialis 20 



4. Irregular hexagonal pattern of the chorion of egg of Melanoplus dif- 



ferentialis 21 



5. Locust mite, Trombidium locustarum, on membrane of locust wing.. . 31 



6. Different stages in the metamorphosis of Sarcophagidae 33 



7. Sarcophaga cimbicis, female 34 



8. Sarcophaga hunteri, male 34 



9. Thorax of Sarcophaga hunteri 36 



10. Erax cinerascens 37 



11. Melanoplus differentialis killed by fungus 38 



12. Front view of head of Melanoplus differentialis with clypeus and la- 



brum removed 40 



13. Front view of head of Melanoplus differentialis with mandibles 



spread out 40 



14. Labium of Melanoplus differentialis 41 



15. Inner view of maxilla of Melanoplus differentialis 41 



16. Clypeus and labrum of Melanoplus differentialis 40 



16. Side view of prothorax with leg of Melanoplus differentialis 41 



17. Side view of thorax of Melanoplus differentialis 41 



18. Metathoracic leg of Melanoplus differentialis 42 



19. Dorsal aspect of body of female Melanoplus differentialis :. 43 



20. Ventral view of thorax of Melanoplus differentialis 44 



21. Side view of abdomen of female Melanoplus differentialis 44 



22. Side view of abdomen of male Melanoplus differentialis 44 



23. Dorsal view of caudal appendages of male Melanoplus differentialis, 44 



24. Exterior view of auditory organ of Melanoplus differentialis 45 



25. Digestive, circulatory and nervous systems of Melanoplus differen- 



tialis 45 



26. Respiratory system of Melanoplus differentialis 46 



27. Side view, showing spiracles of mesothorax of Melanoplus differen- 



tialis 47 



28. Reproductive system of female of Melanoplus differentialis 47 



29. Plan of construction of hopper-dozer 57 



30. View in front of hopper-dozer, showing quantities of grasshoppers just 



taken from the pans 59 



