Dorothy J. Jackson 



101 



pots of clover kept out of doors and the date of oviposition observed. 

 The results of these observations are here tabulated. 



typical of very old female. obtained, easily dis- 

 tinguishable from the 

 new generation by 

 condition of repro- 

 ductive organs. 



(6) Experiments. 



In order to determine the length of Hfe and the period of oviposition 

 adults collected at Wye in October 1918 and laying eggs were sleeved 

 on clover growing in pots out of doors. On January 27th, during deep 

 snow, some of the beetles were removed to a glass dish which was left 

 in one of the pots, and two or three eggs were laid in it, but many of the 

 beetles died, doubtless owing to insufficient protection from the severe 

 frost. During the winter many of the remaining weevils in the pots died, 

 but those that survived laid eggs in April and throughout May. By the 

 end of May some had ceased oviposition and by June 22nd only a few 

 individuals were still laying eggs, and still fewer in the beginning of 

 July. By the middle of the month most of them had died, though one 

 or two survived till August. 



Period of emergence of imagines. This was determined by breeding 

 experiments to be described later in which the weevils emerged during 

 August and September. When sleeved on clover they commenced 

 oviposition on October 22nd, about a month later than the specimens in 



