— 36 - 



About Carcaraña and several other localities in the Republic, 

 hundreds of the winged insects are to be seen in which the 

 wings are not more than one-half or three-fourths their proper 

 lengtii. This is on account of the lack of moisture. Of course 

 these short-winged and crippled individuals can never return 

 to the winter quarters and must eventually fall prey to birds 

 and other natural enemies without propagating their kind. 

 One of these short-winged individuals is shown in plate 26. 



Favorable and unfavorable winds for the migrating insects 

 might also be classed under the present heading, since they 

 affect favorably or ttnfavorably the insects which comprise the 

 invading and returning mangas mentioned on another page of 

 this report. 



During the past spring, while the locusts were retained in 

 their winter-quarters rather longer than usual, when they did 

 begin their advance they were favored with northerl}' winds 

 to such an extent that they were enabled in a very short time 

 to penetrate to regions further south than at any previous time 

 so far as records show. Instead of the bulk of eggs being depos- 

 ited in several of the nearer provinces they were scattered 

 far and wide so as to be pretty evenly distributed over the 

 greater part of the Republic. In this manner the very favorable 

 winds in spring have been the means of placing the pest at the 

 mercy of its natural enemies over a greatly extended area. 

 Besides, so many of the young will have been reared at such 

 great distances from the natural wintering quarters, that only 

 by similar favoring circumstances can they be expected to 

 return before winter overtake them. 



