92 COTTON CULTURE. 



be invaded, if at all, so late in the season that the ravages 

 of the worm are only a little before frost, and but mod- 

 erate injury is produced. 



4th. It probably originates in Mexico and South Amer- 

 ica, and from some unknown cause occasionally migrates 

 northward. 



THE ARMY WORM. 



Without pausing now to speculate or sum up the ob- 

 servations on the origin of this devourer, it will suffice to 



Fig. 17. THE ARMY-WORM AND MOTH. 



DESCRIPTION : a, the caterpillar, or army-worm ; , cocoon formed of particles 

 of earth cemented together with silk or gum ; found under stones or in the earth ; 

 c, chrysalis ; c?, moth. The moths vary very much in color and markings. 



remark that he differs both in appearance and habits from 

 the cotton worm or caterpillar described on the foregoing 

 pages. Of voracity equal to that of the cotton worm, he 

 is a general consumer of every green crop in the line of 



