68 Mr. G. A. Thrupp’s Wotice of a Smerinthus Populi. 
XIII. Notice of a Gynandromorphous Specimen of Sme- 
rinthus Populi. By G. A. Turupp, Esq. 
[ Read 4 September, 1843.] 
I wave great pleasure in submiting to the notice of the Society 
an interesting specimen of gynandromorphism in Smerinthus Po- 
puli, captured in July this year (1843). In the size of the thorax 
and abdomen, the characters of this specimen are decidedly female. 
The right antenna and the right wings, both in shape and in the 
colour of their upper surface, represent those of the male—the left 
antenna that of the female. ‘The left anterior wing is very sin- 
gularly modified. The anterior third of its upper surface is pale 
in colour, and the markings are similar to those of the female, 
with the contour towards the apex more angular than that of the 
corresponding wing on the opposite side; yet the remaining two- 
thirds of the wing are male in the markings and characters, as 
are also those on the left posterior wing. ‘The right tibia of the 
first pair of legs is densely clothed with long hairs, as is usual in 
the male, whilst the left is scantily furnished, as in the female. 
The under surface of both pairs of wings is characteristic of the 
male, with the exception of a small portion of the left anterior 
wing, which is nearly destitute of the dingy white apical spot ob- 
servable in the male sex, while the colours of the right wings are 
paler than those of the left. The costal half of the left-hand wing, 
the side on which the antenna is female, is however darker 
coloured than the inner half. I may remark, as regards the in- 
ternal parts of the body, that in the males of S. populi I have found 
two small white bladders close to the apex, both of which struc- 
tures were apparent also in this instance; added to which the 
abdomen was full and even distended with eggs. I would further 
direct attention to the absence in this specimen of bilateral sym- 
metry in the distribution of the sexual characters, so strongly 
marked in other specimens of this singular kind of gynandro- 
morphism which have been described. 
