126 



JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol.9 



The following unsuccessful attempt was made to get a second gen- 

 eration or at least a partial brood. Three sets of males and three of 

 females that had matured since August were placed in cold storage 

 in September. One set was left one week, the second two weeks, and 

 the third three weeks, at a temperature varj'ing from — 4°F. to +12°F. 

 These were then removed to a greenhouse and the males and females 

 put together and given summer conditions. Xo mating occurred and 

 all adults soon died. A check, run under natural conditions, also 

 failed to produce a second generation. 



Concerning hibernation, more work is necessary. A large majority 

 pass the winter in their pupal cells, but those lea\'ing the stalks in late 

 summer and early fall must be accounted for before winter methods of 

 control can be thoroughl}" successful. 



Summing up the seasonal appearance of this bill-bug, we find the 

 adults present in fields throughout the fall, winter, and larger part of 

 summer, eggs in ]May, June, and sometimes July, larvi3e from the first 

 part of June to the middle of September, while the pupse are present 

 from the latter half of July to the last of September. 



Fig. 9. Diagram representing the seasonal appearance of the maize biU-bug 



