. The American entomologist. Entomology. ST. LOUIS, MO., NOVEMBER, 1868. VOL. 1. NO. 3. •pUBLISnED MONTHLY BY R. I>. STXJIDLE~X- ho7-a W-Uneata, Say).—Up to the au- tumn of 18G5, it was generally supposed by Economic Entomologists, that tliis destructive insect had existed for time immemorial in the Nortliwesteru States, feeding upon some worth- less weed or otli- crif cr; and that of late years, from some unexplain- ed cause, it had all of a sudden taken to attack- ing the Potato- plant. In Octo- ber, 1805, the se- nior editor of tills journal publish- ed apaper,show- ing that origin- ally
. The American entomologist. Entomology. ST. LOUIS, MO., NOVEMBER, 1868. VOL. 1. NO. 3. •pUBLISnED MONTHLY BY R. I>. STXJIDLE~X- ho7-a W-Uneata, Say).—Up to the au- tumn of 18G5, it was generally supposed by Economic Entomologists, that tliis destructive insect had existed for time immemorial in the Nortliwesteru States, feeding upon some worth- less weed or otli- crif cr; and that of late years, from some unexplain- ed cause, it had all of a sudden taken to attack- ing the Potato- plant. In Octo- ber, 1805, the se- nior editor of tills journal publish- ed apaper,show- ing that origin- ally its exclusive home was iu the Rocky Moun- „ , , , , ?' Colors—(a) deep oranc tains, where it had been known to exist for at least forty-five years feeding upon a wild species of potato peculiar to that region (Sohmum rostratum, Dunal) ; that when civilization marched up to the Rocky Mountains and potatoes began to be grown in that region, it gradually acquired the habit of feeding upon the cuUivatcd potato; that in 1859, spreading eastward from potato patch to potato patch, it had reached a point. one hundred miles to the west of Omaha city, in Nebraska; that in ISGl, it invaded Iowa, gradually in the next three or four years spread- ing eastward over that State; that in 1864 and 1805, it crossed the Mississippi, invading Illi- nois on the western borders of that State, from the eastern borders of North Missouri and Iowa, upon at least iive diflerent points on a line of two hundred miles; and that iu all probability it would iu future years " travel onwards to the Atlantic, establisliing a permanent colony wher- ever it goes, and pushing eastward at the rate of about fifty miles a ; (Practical Unto- moloyist, Vol. I, No. 1.) A remarkable pecu- liarity in the eastern progress of this insect was subsequently pointed out by the same writer in 18CG, namely, that " in marcliing through Illi- nois iu many separate columns, just as Sherman marched to the s
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