44 
emerged after this, however, showed me that I had a most interesting 
race in my possession, for the emergence of a dark suffused specimen 
was rapidly followed by the emergence of others, some approaching the 
normal form, others more or less (generally more) suffused, with several 
specimens entirely black, and two males so intensely black, that the 
markings could only be detected with some difficulty (fig. 6). I gave one 
specimen away, beside that previously mentioned, and four pairs were 
wasted in getting a supply of ova. The remainder, consisting of fifty- 
five males and forty-two females, I exhibit to-night. 
The first thing which strikes one is the general fact that there is a 
very strong tendency for the sexes to follow their respective parent 
forms. Thus the male parent was the darker, and only five out of 
the fifty-five males bred, show any white in their coloration. On the 
other hand, out of the forty-two females, thirty-six have more or less 
white in them, some being quite normal in their appearance, without 
even a semblance of a central band, others being more or less 
suffused, the darkest, however, having white patches in the basal and 
subterminal areas (vide figs. 5a and 6a). Fig. 6a represents the darkest 
$ bred. 
In the males again, there are seven which show a mottling in these 
areas (basal and subterminal), having them paler than the rest of the 
wing (vide figs. 4 and 5), but they are in no way white. Corresponding 
with these there are five females, although in these five there are 
absolute traces of white, such traces, however, being slight enough 
(vide fig. 4a). The remainder of both sexes are black, that is, forty- 
three males and one female (vide figs. 6 and 6a). Of these forty-three 
males, tw r o intensely b ] ack specimens have been before referred to. 
One of these is figured (fig. 6), but the figure is not so dark as the moth. 
I think these facts point to the influence of the sexes on the 
progeny in a given direction. I know the material is too slight to 
generalise upon, but as a fact it must be taken for what it is worth. 
There is a considerable amount of variation in the intensity of the 
coloration of the hind wings, following, as might be expected, to a great 
extent, the coloration of the upper wings, although not entirely so, and 
also in the fringes. In the paler males and females, the fringes are 
alternately light and dark. As the specimens get darker, the fringes 
also get darker, until, in the darkest specimens the fringes are con- 
colorous with the rest of the wings. 
There seems to be some sort of general rule as to the way the 
suffusion and darkening is carried out. The first step seems to be 
always the development of a dark transverse central band, due to the 
coalescence of, and the filling in with dark scales between the two 
wavy transverse lines, situated in the central area (vide figs. 3a, 4a). 
The outer margin is the next portion of the wing to become darker, 
the subterminal area remaining pale longer, whilst the basal area 
remains pale the longest of all. These last two areas are often 
suffused (vide fig. 5a), but yet distinctly paler than the first two. Even 
in positively black specimens these areas can be traced. 
The abdomina vary much. Of the males, four dark and three paler 
ones show the normal red and black rings. Two pale and three dark 
males show a whitish abdomen with blackish abdominal tufts. What 
should be the red rings in the other specimens, are suffused with dark, 
the normal dark rings being still darker. Two or three of the blackest 
show scarcely any trace of rings (vide figs. 5a and 6). 
