26 



produced imagines between September 20th and October 29th, 

 except some half dozen which are still feeding similarly to the 

 above.* 



It would appear, therefore, that, although there are two fairly well- 

 defined broods in the course of the year, the larva has the power of 

 prolonging its life very considerably under conditions that are not 

 favourable to its rapid development, a circumstance that must be of 

 great advantage to a species that, as in this case, has to accommodate 

 itself to climatic conditions that are less favourable to its rapid 

 development than are those of its original habitat, and suggests the 

 probability of this Mediterranean species, now that it has found its 

 way here, being able to fully establish itself, at any rate in our 

 southern counties. 



* April 12, 1908. — During the past week one of these larvae has pupated, 

 and another is now in process of pupation. 



