178 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 3 



satisfactoiy work. When the nozzles are properly set and the 

 coarse spray is used the fans meet about four or five feet from the 

 nozzles and at 200 pounds pressure give a fine driving spray that 

 can be directed downward into the calyx cups and do very satisfactory 

 work. 



Secretary Burgess: I would suggest to the members that after 

 they see the spraying demonstration tomorrow, they try an adapta- 

 tion of the solid stream spray, as I believe it is the coming system 

 for treating apple orchards. 



President Britton : The next paper will be read by Prof. K. A. 

 Cooley, Bozeman, Mont., entitled "Notes on the Ten-Lined Potato 

 Beetle in Montana. " ' 



NOTES ON THE TEN-LINED POTATO BEETLE IN 



MONTANA 



By R. A. Cooley, Montana Agricultural College 



During the summer of 1907 and again in 1908 frequent observations 

 were made on the life history of the ten-lined potato beetle in a small 

 patch of potatoes in the home garden at Bozeman, ]\Iontana, and the 

 writer became convinced that only one brood of larva was produced. 

 The principal points in the life history were followed during both 

 seasons, including the first appearance of the adults, the eggs on 

 potato and on closely related wild plants, the development of the lar- 

 vae, their disappearance for pupation and the subsequent appearance 

 of fresh adults. In both seasons the adults disappeared without 

 depositing eggs for a second generation. 



It seemed desirable, however, to make cage experiments, and 

 accordingly adults were taken into the insectary on June 19, 1909, 

 Our notes for this season show that the first adult was observed on 

 June 2. On June 7 adults were becoming plentiful and were seen 

 on potatoes in the garden, and on June 13 eggs were being laid plen- 

 tifully. The beetles taken on June 19 were then clearly of the over- 

 wintered brood. These beetles in the cages laid eggs promptly and 

 plentifully. The first eggs hatched in thirteen days and the larvae 

 went into the earth on July 13. The first adults appeared on July 

 30, and after feeding for a few days disappeared into the earth on 

 August 13. 



Most of the over-wintered females died after laying a few clusters 

 of eggs, but one individual continued to lay at frequent intervals 



