- IS - 



World and in North America AviU apply uqiKiU}' \vell here in 

 Argentina. Locusts here during their life as voladoras may 

 lly to even greater distances than those recorded above. 



Like as in North America, we can recognize several distinct 

 movements in the swarms of ScJiistocercci paraiiei/s/s as 

 exhibited here in Argentina and the adjoining portions oí" 

 Uruguay, Paraguay, Brazil, Bolivia and Chile. These may be 

 designated as "Invading swarnis"", "Local swarms", and "Re- 

 turning swarms"; although we have, as yet, not succeeded in 

 definitely locating a "permanent breeding place" for this 

 insect. 



By Invading sivai'n/s we mean those swMrms that come 

 from a point to the northward of the settled districts of Santa 

 Fé, Córdoba, Entre Rios, etc., in the spring of the year. These 

 invading swarms are usually composed of insects that have 

 wintered as voladoras in the "Chaco"" as is the almost general 

 belief here in Argentina. They are, as a rule, of the dark or 

 reddish form. This, as shown on a preceding page, indicates 

 that they are o/t/ locusts which have wintered over. Invading 

 swarms move towards the south, east, west, and north, accor- 

 ding to tlie region over \vhich they pass. It is the locusts of 

 these swarms which deposit the eggs that later produce the 

 myriads of saltonas in invaded districts. 



The terra Local sivt/rnis may be applied to the small mangas 

 or swarms that drift about irregularly wnth the wind both in 

 the "wintering" and "temporary or invaded" districts. Such 

 swarms are most common just before the general movements 

 commence in late summer, fall and spring. They may also 

 be observed occasionally during pleasant days in Avinter. 

 These flights seem to result from restlessness and a desire for 

 new food rather than for breeding purposes or securing proper 

 hibernating conditions. These local flights never last more 

 than an hoar or two, nor cover more than a score or so of miles 

 of territory; and they are just as liable as not to return on 

 the foUoAving daj^ to the point from which the}' originall 3' 

 started. 



The Returning sivarms are made up of young insects that 

 are very likely in search of Ihe proper locations in which to 

 pass the approaching winter months. They are the progen\' of 

 the invading swarms; and, as a rule, move towards the general 

 direction from Avhich their parents came. This general move- 

 ment is, of course, more or less deviated from in different parts 



