on September 20th. and the last on October 30th. The times of 

 appearance in Guernsey and in Britain approximately agree, it being 

 in both places a late autumn species ; whereas, if Milliere's assump- 

 tion is a correct one, in the south of France it is on the wing only in 

 early spring. I think, however, that in this he must be mistaken, 

 especially having regard to his account of the larval history, and 

 that Tutt's assertion of its double-broodedness must be accepted. 

 It is, of course, quite possible that an insect that is double-brooded 

 in the south of France may have failed to produce one of its broods 

 on becoming established in the more northern British locality, or, 

 indeed, even so far north as Guernsey, but in such a case it seems 

 hardly reasonable to suppose that it would be the spring emergence 

 that would be suppressed, and, although both in Guernsey and in 

 Britain the species has so far been found only in autumn, I am 

 strongly of opinion that we shall find a spring brood also if we look 

 for it, or, indeed, that there is a succession of broods continuing so 

 long as warm weather permits the larva? to feed up rapidly. The 

 selection of an evergreen as its food-plant in these more northern 

 localities appears to me to be an additional reason for thinking that 

 this is so. 



It would be interesting to know how the species got here, and 

 whether it has existed on our south coasts for some years and been 

 overlooked, or whether it is of quite recent introduction. I hardly 

 think that we owe its introduction to any migration, although the 

 spread first to Guernsey and then to South England might favour 

 that hypothesis. The species appears to be of sluggish habits, and 

 the chances of its having been introduced in plants in one of its 

 earlier stages are more probable, I think, than its having flown here, 

 or been blown over. Nor do I think it likely that it has been 

 established here for any great length of time. Apart from the 

 improbability of so distinct a species being continuously overlooked, 

 there are two points that appear to me to strongly favour this 

 conclusion. Milliere tells us that 75 per cent, of his larva? yielded 

 the Dipterous parasite, Morinia bigoti, Mill., yet not one of the larvae 

 or pupa? which I found was attacked by a parasite, and it appears 

 improbable that a species, prone to such attacks, would long remain 

 in any locality before receiving the attention of such persistent 

 visitors. The:', again, although the species has been taken at places 

 so far apart as Bognor and Eastbourne, the area over which I found 

 it at the latter place was exceedingly restricted, and, although I 

 carefully searched other equally suitable hedges within a few hundred 

 yards of that spot, I failed to find any trace of it, which, to my mind, 

 suggests that the colony was recently founded, and had not had time 

 to spread. I doubt not that there may be many similar colonies 

 within the length of coast line indicated, but at present the chances 

 are that each one will be found to be of but very limited area. 



