Life-History. 



at certain periods in their existence do so suddenl)- 

 and rapidl}', and the present is one of the most 

 striking" instances of it. The wings are seen to 

 be expanding at the base, and this expansion slowl}' 

 proceeds till after half an hour or so it has reached the 

 tip and the wings are of their full size, though still 

 \-ello\v and opaque. This process is accompanied by 



Fig. 9. — iMACiO OF LniEI.LlLA qiad- 

 RIMACri.ATA, jrST EMERGED AND 

 HANGING TO THE EMPTY NVMPH- 



CASE. Wings bit little De- 

 veloped. 



Fig. 10. — Imago of Likel- 



LULA yUAlJRIMACULATA, 



lately Emerged. Wings 

 full-groavn, but not yet 

 Expanded. 



twitchings of the abdomen from front to back, while in 

 some cases it is at intervals bent forward at the tip and 

 then contracted lengthwise, as if air was being forced 

 from it into the wings, which perhaps is the case, for 

 the\' consist of two la}'ers which seem to be slightly 

 separated during the progress of the metamorphosis. 



