TABLE OF CONTENTS. 



Page. 



Letter of transmittal II 



Financial report HI 



Table of contents VI 



Introduction ^I 



The Ortlioptera of Alinncsota — Historj- 3 



How locusts deposit their eggs "L'i 



Remedies against locusts 21 



Plowing ••••■ 22 



Burning 23 



Collecting the eggs 24 



Poisoning 24 



Catching by means of hopper-dozers and other machinery.. 25 



Remedies against cockroaches and other orthopterous insects.. 32 



Poisons 33 



Fumigation 33 



Trapping 35 



Parasites and other enemies of locusts 37 



Red-mite 39 



Tachina-flies 41 



Flesh-flies 42 



Bee-fly 42 



Blister-beetles ; 44 



Other parasites and cannibals 45 



Other enemies of the locust 48 



Value of locusts for fertilizers 49 



Conclusion 50 



External anatomy 51 



The head 52 



The thorax 55 



The wings 58 



The legs 60 



The abdomen 61 



Explanations to illustrations of anatomy 66 



Internal structure 67 



The respiratory system 68 



Air-sacks 68 



Digestive organs 69 



The reproductive organs 71 



The nervous svstem 71 



Metamorphoses 72 



Stridulating organs and the ear 76 



