TRANSACTIONS OF SECTION D. 799 



When this gain takes place it is now almost universally admitted that human 

 measures ought to be resorted to with the view of aiding the natural agencies, so 

 that the insects may be reduced in number to a point that is safe or free from 

 danger. 



I. The Natural Agencies for Checking the Plague. 



Destruction by (1) the wind; (2) birds; (3) reptiles, lizards, toads; (4) 

 mammals and fish ; (5) wasps ; (6) disease : — («) internal larvte from the 

 Tachino fly, (b) Mylabris parasite, (c) Mermis parasite, {d) Cynomia pictifacies 

 parasite, {e) Empusa grylli parasite, (/) various others, such as mites; (7) eggs 

 destroyed by insects, animals, weather, water. 



II. Artificial and Mechanical Means for Chechlng the Plague. 



1. Ingenuity or finessing. 2. Destruction of the eggs by — («) Machines, 

 ploughs, harrows ; {b) eating by pigs ; (c) tramping the ground ; {d) irrigation ; 

 (e) judicious use of chemicals; (/) collecting the eggs. 3. destruction of hoppers 

 by — (a) maiming, (i) crushing, (e) tramping with stock, (d) diverting, (e) 

 catching and bagging, (/) trapping, {(/) burning, (Ji) use of chemicals, (i) inocu- 

 lation of fungi. 4. Destruction of the winged locusts by — («) diverting a flock 

 or flight, (b) shooting them on the wing, (e) maiming, {d) chemicals, (e) tramping, 

 (/) crushing, (g) burning, (Ji) catching and bagging, (i) inoculation of the flying 

 locust with a fungus. 



