August 10 should \>c so interpreted. It seems to me more likely, 

 however, that this was a belated member of the same brood as the 

 other larvjr reared by us, and that its pupation was retarded by 

 neglect. Our failure to find pupir except in the middle of the sea- 

 son is nef^ative evidence of the absence of a second brood. It is of 

 course true, on the other hand, that in the absence of numerous 

 continuous experiments in the breeding of separate individuals, no 

 final statement can be made with respect to the number of genera- 

 tions. 



Briefly stated, as now understood, the life history is substan- 

 tially as follows : Ilil^ernating in the imago, the beetle lays the 

 eggs in early summer, beginning probably in May ; larvic hatch 

 in June and doubtless for some weeks thereafter ; pupation begins 

 in July, and the final transformations to the adult, beginning late 

 in that month, continue into August and possibly for some time 

 thereafter. 



INSTANCHS Ol' INjlIKV TO COKN. 



'I'^hc most definite and serious case of the destruction of corn 

 by this beetle which has come to my knowledge was reported to me 

 by Mr Dalbey, of Taylorville, late in June, r>02. 



A visit to this place made June 30 by Mr. K S. (r. Titus 

 showed that in a field of forty acres the injury was decidedly un- 

 equal but still very general. In one part of the field nearly every 

 stalk on several acres had been injured, while in other parts the 

 damage varied from twenty-five to fifty per cent, of the plants. 

 This Held had been in timothy for the four preceding years, and 

 was broken up in April, 1902, and planted almost at once to corn. 



Some twenty timothy fields in this neighborhood were care- 

 fully examined, and the root bulbs in all were more or less infested 

 by the larva;- of this bill-bug. Fields two years in timothy after 

 corn or wheat showed ten to twenty per cent, of the plants infest- 

 ed, while in those three and four years old from fifty to seventy- 

 five per cent, were more or less injured, and contained larva- vary- 

 ing in si/.e from medium to apparently full grown. 



A second field of corn on timothy sod, plowed early last fall 

 and planted at the same time as the one first mentioned, contained 

 not a trace of bill-bug injury, although dead timothy bulbs still in 

 the ground showed distinctly that they had been hollowed out by 

 bill-bug larva. The contrast between these two fields of corn 

 growing on old timothy sod infested with the larva- of Sphoiopli- 

 urus the previous year, one of the fields having been plowed in 

 April and the other in early fall, was particularly significant, and 



