INJURIOUS INSECTS. 317 



The illustrations are mostly from drawings made by Pro- 

 fessor Riley, and so need no praise. 



When we remember that more than one hundred insects 

 attack the apple tree, we see how impossible it is to treat 

 of them all at this time. Only the more destructive can re- 

 ceive attention. In lieu of fuller information our readers are 

 referred to Packard's Guide to the study of Insects, Harris' " In- 

 jurious Insects," Saunders' "Insects Injurious to Fruits," and 

 "Injurious Insects of the Farm and Garden," by Mrs. Treat. 

 All of these works are well worth a place in the library of 

 every practical agriculturist. 



Colorado Potato Beetle. Doryphora IQ-lineata, Say. 

 Order, Coleoptera. Family, Chrysomelida. From the importance 

 of the potato, the prevalence of this insect, and the extent of its 

 ravages every season, it deserves a first place in our discus- 

 sion. Though in this case we have a very cheap and perfectly 

 effective remedy, still, actual observation and the high price of 

 potatoes prove that barely half, our farmers make use of it. 

 There can be no doubt that should this article induce all our 

 farmers " to fight the potato beetle by the most approved 

 method," it would add greatly to the agricultural wealth of the 

 country. 



HISTORY. The history of this beetle, that it is a native of 

 Colorado, where it was discovered, named, and described by 

 Say, many years ago ; how, on a bridge of potato vines, it 

 invested our Western States less than a score of years since, 

 and from thence spread rapidly eastward till it now has actu- 

 ally gained our Atlantic coast, where it only awaits opportunity 

 to take passage for Europe, where it will continue its dreaded 

 ravages in the green fields of the Emerald Isle, all this is 

 already well known. 



NATURAL HISTORY. The natural history of the potato beetle 

 is also familiar to most of our farmers. It comes forth out of 

 the earth as a beetle just as the potato vines are peering from 

 the ground. Sometimes, as the creature stands over the hill, it 

 seems fairly to grin in expectant longing for the rich, tender 

 feast which nature is about to spread. With the coming of 



