Half hours with insects . ebeetles food not great. By 1859 it had spread eastward towithin a hundred miles of Omaha, Nebraska. In 1861 it 14 Packard.] IJSrSEOTS OF THE FIELD. 207 passed into Iowa, and in 18G4 and 1865 it crossed tlie Mis-sissippi, a thing whicli never ought to have been invaded Illinois on its western border, crossing over fromnortheastern Missouri and Iowa. Mr. Walsh predicted thatit would advance eastward at the rate of fifty miles a 1868 it appeared in Ohio. Mr. Riley states that its aver-age annual progress towards the east has been upwards ofseventy mil
Half hours with insects . ebeetles food not great. By 1859 it had spread eastward towithin a hundred miles of Omaha, Nebraska. In 1861 it 14 Packard.] IJSrSEOTS OF THE FIELD. 207 passed into Iowa, and in 18G4 and 1865 it crossed tlie Mis-sissippi, a thing whicli never ought to have been invaded Illinois on its western border, crossing over fromnortheastern Missouri and Iowa. Mr. Walsh predicted thatit would advance eastward at the rate of fifty miles a 1868 it appeared in Ohio. Mr. Riley states that its aver-age annual progress towards the east has been upwards ofseventy miles. At the same rate of progression it Avilltouch the Atlantic Ocean in about ten years from now, 1878.* But in fact it has travelled faster than that,and the year 1876 will witness the arrival of this pilgrimfrom the west in the potato patches of the descendants ofthe Pilgrim Fathers. This beetle belongs to the family of leaf-eating Coleoptera(or Chrysomelidse) of which the common striped squashFig. 153. Fig. Doryphora juncta. D. 10-lincata. beetle is a familiar example. It lays its eggs on the leavesof the plant it inhabits in the larva, or grub, and the adultstate ; while in the pupal, or inactive, period of its existenceit lives in the ground, just under the surface of the 153, from Riley, gives an idea of Doryphora juncta, anally of this insect, in its different stages. All the draw-ings are of the size of life except d, a wing cover, and e,representing a leg enlarged; a represents the yellowish ?First Annual Report on the Noxious and Beneficial Insects of Missouri,1869. p. 102. 15 208 HALF HOUBS WITH HNSECTS. [Packard. eggs ; &, larva fully grown and soon after hatching; c, thebeetle itself, Avhich is cream-colored, with three black stripeson each wing cover. Figure 154 represents Doryphora\Q-lineata. The larva is pale yellow, with a reddish tinge,and a lateral row of black dots. I quote from Mr. Rileys report the following account ofits habits. I
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectinsects, bookyear1881
