CHAPTER IX 



Summary. 



We have ascertained that the destructive locust of the 

 Argentine Republic is distinct from both the North American 

 and Old World species, as well as from two or three other close- 

 1}^ allied forms found in tropical and sub-tropical America. That 

 it winters as a voladora in the vicinity of the 30^'^ degree of 

 south latitude ; and also that the freshly winged, the wintering, 

 and the egg-laying insects can each be recognized by their 

 prevailing colors. In other words, these three stages in the 

 insect's career are to be known by special color-characteristics. 

 We have ascertained, or believe we have, that the insects 

 which obtain their wings in January do not lay till September 

 or October ; that normally it is but single-brooded, and that 

 only one cartitcJio of eggs is laid by each female. Our data 

 seem also to show a return to the north for wintering of all 

 insects reared southward of the 30th degree of latitude. It has 

 been ascert'iined that this locust is a poor hopper, but an 

 excellent flier. Nevertheless it is one of the easiest of all des- 

 tructive locusts to fight on account of its habits of always 

 bunching. A very important and useful fungus-disease of the 

 insect has been found, and tested with good results when 

 climatic conditions were favorable. Various methods of war- 

 fare have been tried and found to be practical; and it has been 

 ascertained that the Argentine locust has many natural ene- 

 mies which if encouraged will by themselves keep it within 

 bounds only in exceptional cases. 



The Government Central Commission is to be congratulated 



