THE LARVA OF PACHETRA LEUCOPHEA. 233 
brown; in A. psi grey, or nearly white. This last is, I think, a 
very tangible point of difference. 
6. The hind wing of A. tridens presents an obvious sexual 
difference which I have not hitherto seen noticed. In the female 
A. tridens and in A. psi, of both sexes, the hind wing is more or 
less shaded darker, especially toward the hind margin; but in the 
male A. tridens the whole of the hind wing is pure shining 
white, and on the white ground the black dots on the hind margin 
stand out clearly. Not even on the veins is there any dark shading 
whatever. 
I may add that in observing this sexual difference in A. tridens 
I was guided by opening the bodies to prevent grease, putting 
those down as males which contained no eggs. 
The foregoing remarks are offered with the hope of eliciting 
the observations of other entomologists who may possess speci- 
mens of the two species which have been bred by themselves, and 
as to the correct naming of which there can be no doubt. 
Holy Trinity Vicarage, Ashby-de-la-Zouch, Sept. 14, 1880. 
THE LARVA OF PACHETRA LHEUCOPHZEA. 
By Grorer ELISHA. 
Or this hitherto unknown larva I succeeded in rearing three | 
from the egg to the pupa state. Unfortunately they did not 
emerge, through, I am now convinced, keeping them too dry ; 
in fact, taking too much care of them. I think if they had been 
left out in the weather they would have done better ; however, a 
few facts concerning them may be interesting, and possibly 
of use to others, to enable them to arrive at a more satisfactory 
result. 
The eggs from the captured female of P. leucophea, mentioned 
in the ‘Hntomologist’ (vol. xii., p. 205), hatched in about three 
weeks; the larve escaped by gnawing a hole through the side of 
the egg, and when first hatched were of a light greenish grey 
colour, and extremely active. Being in doubt as to what kind of 
grass they fed on, LI went specially to Box Hill and cut out some 
turfs of grass of nearly every sort I could see, and placed them 
side by side, so as to make a compact sod of grass in the cage. 
The larve soon crawled out of the pill-box onto the grass, and 
2H 
