24 
The situations where it is found are woods. 
The date of the appearance of the perfect insect i3 
in the month of July. 
SESIA SCOLIEFORMIS. 
Plate VI. Figure 5. 
This insect measures from an inch to an inch and 
nearly a quarter across. Male: front wings transparent, 
bluish black on the upper edge, outer edge the same, 
the centre bar also the same. Hind wings fringed with 
bluish black. The body bluish black with two rings of 
yellow, the thorax the same colour with two slanting 
yellow lines on the sides; the tail-tuft dark brown shaded 
with deep yellow. 
The only locality for this species as given by Mr. 
Stainton is Bryn Hyfrid near Llangollen, where it was 
taken by Mr. Ashworth. 
The dates of the appearance of the perfect insect are 
in June and July. 
The date of the appearance of the caterpillar is in April. 
It feeds on the wood of the birch tree. 
SESIA SPHiECIFORMIS. 
Plate YI. Figure 6. 
This, which is another rare species in this country, 
measures about one inch and one line across. Male: front 
wings transparent, black on the upper edge, the outer 
edge black tinted with purple, the centre bar purple- 
black. The hind wings transparent, fringed with purple- 
