("2") | [viii 
added specimens of both sexes of the parent forms for com- 
parison, and it will be seen that the cross-product (which 
Standfuss calls S. emilix) resembles a large S. pavonia rather 
than a small S. pyri; except that the sexual disparity in size 
and colour, which is so marked in S. pavonia as compared with 
S. pyri, is very little developed in the hybrid. In most of 
Standfuss’s specimens of this hybrid, some of the veins are 
forked terminally. This it will be seen is the case with one 
vein of the right fore-wing in the male exhibited. 
“The second form is a hybrid with a somewhat more 
complex ancestry. It consists of three males and three females 
of which the female parent is S. pavonia, and the male parent 
a hybrid between S. pavonia, 3, and S. spini, Schiff, 2, ae. 
the cross-product to which Standfuss has given the: name 
S. bornemanni. The present form (called by Standfuss SS, 
schaufusst) is therefore, in the common way of reckoning, 
three-quarters S. pavonia and one-quarter S. spini. Dr. 
Standfuss’s first attempt to rear it ended in failure, his speci- 
mens all dying in the larval stage. Subsequent trials, however, 
were more fortunate, and some examples of Standfuss’s own 
rearing are figured in the ‘ Entomologist’ for 1900, Pl. VII, 
figs. 6, 7, 8. The six individuals I now exhibit were reared 
from eggs kindly sent me by Dr. Standfuss in 1895, and are 
some of the actual specimens mentioned in the footnote on 
p. 189 (p. 5 in the ‘Hope Reports’) of the paper above 
referred to. 
‘Their history is briefly as follows :— 
1895. 
May 11. Eggs received from Dr. Standfuss. 
» 23. Eggs nearly all hatched. lLarve black, hairy. 
Fed on whitethorn. Show distinctly gregarious 
habit. 
June 3. Larve undergoing first moult. Some in second 
stage show a rather indistinct yellowish-brown 
lateral line. They are still gregarious. 
» 14. Larve in second moult. In third stage still 
black, but some have a yellow or orange lateral 
line. 
