93 



within my own experience. I have reared many broods 

 during the past ten years or so, and have frequently tried 

 to induce them to produce a second or summer emergence, 

 but have signally failed in the attempt, the larvae most per- 

 sistently hybernating, the only exception previously to the 

 present instance being the emergence of a single individual 

 on October 7th, in the exceptionally hot year, i8gg — one 

 out of close upon two hundred larvae that I then had feeding 

 up. The parent from which the series now exhibited was 

 bred was taken in my garden (where, I may say, I have 

 obtained all similar moths from which the former broods 

 have emanated) on July ist ; the ova hatched on 12th of 

 that month, the time occupied being from two to three 

 days longer than is often the case. For the next fortnight 

 the larvae grew at about the usual pace, being then quite 

 small, and all of apparently just the same size. Durmg this 

 period the weather had been unusually hot, the screened 

 thermometer registering day temperatures of from 80° to 92°, 

 and night seldom so low as 60°. On 27th a series of thunder- 

 storms passed over, leaving unsettled and much cooler 

 weather in their wake, day temperatures failing to reach 80°, 

 and often but little exceeding 60°. Despite this sudden drop 

 in temperature, more than half the brood of larvas com- 

 menced to grow rapidly, and by August 12th were pupae ; 

 the remainder have grown but little, and have now settled 

 themselves down for hybernation. 



"The first moth emerged on August 31st, and the last on 

 October ist. Rather more than half of this emergence 

 followed the female parent, in that they were of the banded 

 form ; the density of the colour of the band, however, varies 

 considerably, being in some of them much paler than in 

 others; the other portion were of the ordinary form without 

 band. The dates of emergence were as follows : 



igoo. Banded. Plain. 

 Sept. 83 I 



o 

 o 

 o 

 o 



Oct. 



31 



22 



Dr. Chapman said that Mr. Turner had called his attention 



to a structure in the pupa of Nona>^ria aruiuliiiis (typhcc). 



