from Kentish ova, of which the larvae fed up in June, 1884, fifteen 

 of the moths emerging in July of that year and seven in May, 1885. 

 There can be no doubt that this power of the pupa to retain its 

 vitality over a lengthened period and then bring forth the perfect 

 insect at the time of year when the imagines of more recent broods 

 are on the wing is a distinct advantage to a species; but it was not 

 with a view to discussing this part of the question that I put these 

 notes together, but rather, by pointing out the frequency with which 

 this power of lying over in the pupal stage is exercised, to induce 

 those who are in the habit of rearing lepidoptera to retain any pupae 

 that may not have emerged at the usual time and to carefully note 

 all the circumstances of each case. It is by such means that we 

 may hope to eventually arrive at how and why this habit is advan- 

 tageous to a species. The moral that I would point is, never throw 

 away pupa; until you know that they are dead ; nay, I would even 

 go further and say, never disturb a pupae cage until you kuozv that 

 you have got all that it is possible to get out of it. 



