LEAF-BEETLES. 



147 



to the cultivated potato. As this beetle is not injurious to any 

 of our fruit-producing plants, but confines its attention solely to 

 such plants as the potato, egg-plants, tomato, ground-cherry and 

 other members of the Solanuin family, it is not necessary to de- 

 scribe it in detail, and only a picture of it is given to show how it 

 differs from other leaf- feeding beetles. (Fig. 150 and 151, Plate 

 II). This beetle commenced its migrations toward the east about 

 the year 1859, reaching the Atlantic Coast about the year 1874. 

 It moved from potato-field to potato-field, and as it had at first 

 no enemies it increased most rapidly to destructive numbers. 

 Xow it has many foes among other insects, birds and mammals, 

 and the farmers know quite well how to fight it by means of -arsen- 

 ical poisons. In fact the utility of Paris-green was first demon- 

 strated by using it against this insect and its nasty looking larvae. 

 Similarly shaped insects abound in Minnesota, but none are 

 especially destructive, except, perhaps, the Chrysomela exclama- 



Fig. 150. — Doryphora 10 lineata. Say. — After Brehm. 



