NOTES ON THE MICRO-LEPIDOPTERA OF SOUTH-WEST LONDON. 105 
were absolutely uninfluenced by the fact that the abdomen was full of 
ova and the genitalia crippled. Thus in these dispar moths the 
genitalia are in every specimen that I have examined male and un- 
crippled; these moths were, in spite of their thickened abdomens, 
most attentive to the females, and if I have but few batches of eggs, 
it may be fairly argued that the excited conduct of the males and their 
failure to pair at once made me fear for the condition of their wings, 
and therefore I was only too ready to condemn them to the poison 
bottles; as a matter of fact I have a batch of ova from the union of a 
very thick abdomened male and a female of the same batch, and these 
seem to be fertile. Then, too, out of seven male abdomens which I 
broke up only one had rudimentary ova. I might therefore conclude 
that a great majority of these mongrels exhibit cases of colour gynandro- 
morphism, i.e., the colour of scales, and hair of wings and body are 
modified either in parts—seeminely determined by the law of hazard 
—or altogether. Against this conclusion, however, an objection may 
be raised, viz., the frequent thickening to a more or less marked degree 
of the abdomen. In certain specimens the abdomen is so broad that 
had I taken them in nature and displaying normal colours, I should 
certainly have examined the abdomens for traces of gynandromorphism, 
yet in six specimens out of every seven that 1 have thus examined, 
there are, we have seen, no signs of gynandromorphism, simply a 
thickening of the Malpighian organs and a mass of liquid matter ; 
possibly then an admixture of imperfectly developed sexual organs 
internally. But if the latter, then according to the observations of 
Tutt and other authors, the ova should not be fertile. This is not the 
case, for the parents of a large number of the larve I raised this year 
were also partially gynandromorphous, if this be gynandromorphism. 
At the same time this partial gynandromorphism seems to reduce the 
possibilities of a fertile union. ‘Thus the proportional percentage of 
difficulty in procuring fertile ova may perhaps be compared with the 
percentage of gynandromorphism remarked in the individual moths. 
Dispar mongrels having a simple stripe or blotch of white on one or 
two wings coupled as freely as pure-bred moths, those having more 
white and broader abdomens coupled with difficulty, and only one, 
having a very broad abdomen and nearly white wings, succeeded in 
coupling at all in the twelve hours I accorded them. One absolutely 
white male I left in the company of two females, one a sister and one 
a pure-bred japonica for two days, but no union was effected. 
(To be concluded.) 
Notes on the Micro-lepidoptera of South-West London. 
By ALFRED SICH, F.E.S. 
(Continued from p. 33.) 
Argyresthia glaucinella, Zell. Richmond, 1909. This small species 
I find usually at rest on the bark of oaks. Here it is not confined to 
trees of large size as has been suggested. Most of my specimens were 
taken in a small wood, planted in 1880, where the trees, as oaks, are 
still young. Some authors have mentioned horse chestnut as a food 
plant besides oak. This should probably read Spanish chestnut. 
Argyresthia semifusca, Haw.—Two specimens out of a mixed hedge 
